He all, you (and your students) might like to know that we just added a new sprite property Game Lab called
sprite.tint that allows you to overlay a color on a sprite. This allows for some pretty cool sprite animations that would be unweildy to do with a bunch of different images. I've put together a quick documentation page for this as well as a demo app so you can see how it's used. Note that you won't see this block in the toolbox on any puzzles yet, but you can use it by switching to text mode and typing it in manually and it's been added to the toolbox on full Game Lab. I can't wait to see what your students make with this!