Instructables
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My oldest son was learning about dinosaurs in his class and it gave me motivation to do these Do-It-Yourself (DIY) Dinosaur Eggs (or rocks if you don't want to shape them into eggs.)

We had all the ingredients, but I would suspect that some people may not have sand readily available to them.  It only takes 1 cup of sand to make the five eggs you see in the photo mixed in with the other ingredients.

The eggs are about 4 to 5-inches long and about 3-inches in diameter and we used an air dry method with plastic dinosaurs (and animals.)

We just did this for fun, but I would expect that these "eggs" could be made in advance of a dinosaur themed party or as part of a dinosaur dig with a group of children.

Overall, it took my kids and I about 30-minutes to mix and mold the eggs, and we waited three days for the eggs to dry.  We broke them up again the day after they dried.

From the photo, you can see that the inside doesn't dry all the way through, but the outside is hard as a rock.
 
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Step 1: Materials

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Materials used to create these dinosaur eggs are hopefully things you have around the house, or nearby (like for the sand, acquired legally of course.)
  • 1-cup all purpose flour
  • 1-cup coffee grounds (the ones shown are used because I can't waste coffee)
  • 1-cup sand
  • 3/4-cup salt
  • 1/2-cup water (or less, see Step 3)
  • four to five small plastic animals or dinosaurs
You will also need a large bowl and a tray or plate to set the eggs out to dry.

Step 2: Mix

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Having fun with my kids was the sole purpose of doing this, so naturally, they had to mix the ingredients together.

Add the flour, coffee grounds, sand and salt together thoroughly.
sdartnut3 months ago

It's a wonder that someone has not made this idea into a cake. I know some adults who would love a Dino Egg cake.

DeandrasCrafts (author)  sdartnut3 months ago

Yes, but don't bake plastic in the oven.... Ooh, but if you put an upside down glass or metal container in the pan before baking the cake, and then use that cake flipped upside down... Hmmm. You might have given me another idea!

Thank you for looking!

I'm not a cake maker but...
I think you could bake two round cake layers. On the frosted top of one put the dino baby (I bet you could make one out of sugar). Put the second one on top of the first and trim away the corners and edges til you get an egg shape. Cook gets to eat the trimmings.
Frost the egg. Boiled spinach and beets would make a suitable natural food coloring for your frosting. Set in a "nest" of chow mien noodles.

Manufacturers DO make egg-shaped cake molds, if you are interested.
Also, there are a number of sizes of plastic Easter eggs, (I've seen them at the dollar store.) Take a medium or large sized one, depending on the size of the toy, and mold some of the "dough" around the halves of the egg. Once dry, you could then place the toy (or treat!) inside and either use "school glue" or more of the mixture to seal the two halves together. You would then have a hollow egg!

DeandrasCrafts (author)  sdartnut3 months ago

I love it! I hope someone tries it!

coolbeanz99893 months ago
This is a great idea!
DeandrasCrafts (author)  coolbeanz99893 months ago

Thank you!

patsheldon3 months ago

Very cleaver and fun!

DeandrasCrafts (author)  patsheldon3 months ago

Thank you!

DonaldCollis3 months ago

Have you thought about a food dehydrator? Very low temp with moving air.

DeandrasCrafts (author)  DonaldCollis3 months ago

I hope someone tries it! I don't have one and don't know much about them. Plastic has a varying melting point, depending on what type it is. In my experience, anything over 90-degrees will begin melting it, although it would be encased in the sand-mixture, so, I just don't know. Thanks for looking/reading!

gzank63 months ago
Really cool... I like how they were hard on the outside but not inside. We msde large dino eggs out of paper machete for our dino party. Baking them would dry them faster but woukd they get solid eventually?
DeandrasCrafts (author)  gzank63 months ago

I will add to the instructable that I do not recommend baking them. They have plastic inside and plastic has a very low melting temperature.

BUT, I would imagine that if you let them dry long enough, then yes, they would get solid eventually. Thanks for the comments!

samueljim3 months ago
I can attest to these (or similar anyway) being a fantastic addition to a dino-themed party. Your mix looks a fair bit dryer than the one we used, which can only be a good thing; several of ours looked more like fossilised dino-poo :)
jubal193 months ago

The second photo in the Intro looked like they were made of colored rice krispies. Are there any gummy dinosaurs? Could you make this edible with a gummy dino surrounded by a cocoa krispie treat shell? Or regular rice krispies treat shell with some coloring to make it look more like stone? I will pass this along to my sister-in-law. I'll bet she'll try it. Thanks for the inspiration.

DeandrasCrafts (author)  jubal193 months ago

You are welcome and thank you for checking this out! I hope she makes one and you can post an instructable for her!

Wynd3 months ago
I'm digging this idea! Going to make some for the kids I watch, for Easter (will add some dye and glitter for effect), ;) Thanks for sharing!
DeandrasCrafts (author)  Wynd3 months ago

I'm glad I could help!

Wow! awesome work :)

DeandrasCrafts (author)  Muhaiminah Faiz3 months ago

Thank you!

pie201020113 months ago
Your kid has his own hammer! I'm not even allowed to have my own tv! Love your instructable! :)
DeandrasCrafts (author)  pie201020113 months ago

Thank you!

I made these and they are awesome
DeandrasCrafts (author)  CommanderCookie3 months ago

Yay! Thanks for telling me!

TheSweetTooth3 months ago
i love it!!! :)
wordtrauma3 months ago
nice! thnx for this!
ekiessling3 months ago
This is a wonderful idea, I love it.
Raduken3 months ago

awesome. i could pick some medium sized rocks and make scaled eggs, like the ones in game of thrones, for a themed party

jmwells3 months ago
Am mixing them now. Had a brainstorm. I'm cooking the flour and water. Making it into paste to stick better.
jmwells3 months ago
My grand kids are going to go nuts. Grandpa "found" dinosaur eggs. Cost me more to ship them than make.
DeandrasCrafts (author)  jmwells3 months ago

Tell me how it goes, please!!! And thank you! I would love to see a photo too!

You can also mould the mixture around the plastic Dino so his head pokes out, like the shell is hatching. Cool!