One of the easiest paint designs your kids can do: Bottle Paint! Whether it's creating a single flower, or a vase of them or even a cherry blossom tree! This craft involves a few old bottles, paper, paint and you can let your kids run wild with it!
DIY Paper Clay Barnacles - by Design Sponge - Tutorial - Very easy to make and looks really cool when done. Going to have to take this idea and use it to do make some other things I've been thinking about.