Step 1: Materials!!!
*Candle Crafting Gel- you can find this at a local craft store, such as Hobby Lobby.
*Something to put gel in-WARNING do NOT make this something that is too flimsy to support the gel.
*Something to put in gel-"Duh".
*A Double boiler-You can either buy one or make it out of various pots.
*Water-I can't help you if you don't know where to get this.
*Aluminum Foil-You can get this at the local supermarket, or Walmart
*A stove-Preferably gas.
AND some free time
Step 2: Prepare...
First cover the top pan in the double boiler with aluminum foil. If this doesn't completely cover the top and the lip the gel WILL stick to the pan.
Next put some water in the bottom part of the double boiler, make sure it isn't enough to go over the top of the second pot.
And the FINAL preparation put the double boiler on the stove and put the gel (not in its tub) in the top part of the double boiler.
Step 3: Melting the Gel
Step 4: Suspending
First pour some of the melted gel into your container, NOT ALL OF IT. Make sure to put the pot back on the double boiler and continue to heat it.
Next put whatever you want to go in that layer of the gel in it.
Then wait for it to dry (not all of the way just moderatly, enough that the objects in the next layer won't sink through it.
Finally Repeat this process until all things are suspended ;)