Having a low budget to get something for my better half I was force to come up with some idea to show my feelings. She likes dragons, so this fun idea came to me. You can do any size you like and it's cheap and simple.
Step 1: Material
Box of desired size
you need to make sure you have enough to cover all the outside of you chosen box and the inside if you so choose.
Step 2: Tools
Step 3: Outside Cover
Then glue the outer cover to the box. Do not leave a large overlap it doesn't look good. With the exes that you have at the bottom, folded to it and make some cuts every 3/4 inch so it doesn't bunch up.
I use a sheet of paper under the cover and make sure i get glue all the way to the border and a little in the paper, just to be sure.
To make sure the cover is tight use the rubber bands as clamps and let it dry.
Make sure you trim the exes.
Step 4: Top and Bottom
Make sure you take your time and do it neatly, so it looks good.
Step 5: Inside Cover
measure and cut the inside sides. Cover with glue, but specially the borders. Place in the box to glue and use a marker or any cylindrical object to make sure all the side is glue evenly.
Trim all exes and make sure the bottom is all cover, no visible lines.
Do the same for the lit and you are done.