DIY Watercolor Paints

How awesome is it that you can make your own watercolor paints at home, using just a few simple ingredients (vinegar, baking soda, cornstarch, corn syrup, and food coloring) that you probably already have on hand?  We had to get a couple extra ice cube trays so each kid could have his/her own tray, but we've been able to use these several times now, so it's definitely worth it.  I found complete directions at this site.
 

What can I say?  My kids are natural artists!  :-)