Tip: darker colors tend to look murky when melted, so stay away from dark blue, purple, brown, gray and black.
Warning: this next one is not for the faint of heart! There is huge potential for messiness, especially if you've lost your hair binder :)
Cut a piece of sturdy paper into a square--ours is 9 inches. We used canvas paper left over from another project, but you could use posterboard, cereal box cardboard, or even cardstock.
Place several quarter-sized puddles of light corn syrup on your paper. Start with 4 blobs in the corners. Squirt 1 or 2 drops of food coloring onto each syrup puddle. Use only one color per puddle and 2 or 3 colors total.
Allow the corn syrup to dry--this could take a day or more, but it will dry shiny and beautifully marbled.
I was really worried about this project--it was touch and go for a while, and it wasn't looking too good (imagine all of the places that colored corn syrup could show up if you let a 4 year old play with it)--but I am so pleased with how it turned out. I love it!
This would be great in the fall with a leaf cut-out shape, or in winter with a snowflake or snowman. You could do a shamrock for St. Pat's Day...well, you get the idea, I'm sure!