Something fun and artsy that I took part in was making a crayon heart. That is what my room mate, Emily, calls it anyway. We made it together one evening. Its not that hard to make but it requires a lot of patience. 

First, we got a big white poster board. You can have any color you want but we thought the colors would contrast if we used just a blank one. Then we sketched a perfectly shaped heart right in the center. You have to make it so that when the crayons bleed there is room for the melted wax to spread. So you cant make it to big or too little. 

After that, we lined up the crayons in order according to the rainbow in opposite directions. Starting at the top going toward your left we started with red and then at the bottom going left we started with red again to get a reversed rainbow look. We got glued the crayons down on to the board lining the bottom of the crayons up with the sketched heart.

Once you have all the crayons lined perfectly you take a hair dryer (girls probably have more of an easy access to one of these) and you start at one of the red crayons. We started at the bottom red crayon going to the left. You have to make sure that the hair dryer is tilted at the right angle so that the wax doesn't bleed into each other. At first the wax will run and be hot, switch the hair dryer to cool air to speed up the cooling and running.

Continue the whole way to the top and you are finished! :)
There are different variations that you can make with this, you could finish the whole heart, use different colors, or even a different poster board color. Its really up to you!