Button Tree Art - a great kids craft idea. But I'd do it on fabric so my girl can practice with needle and thread. Trunk and branches could be brown ribbon.
For when the grandkids are older. DIY Sun Catchers -- 29 fun crafts for kids that parents will actually enjoy doing, too!
Dollar store frames are perfect for making window art with glue and food coloring. | 27 Useful Dollar Store Finds Every Parent Should Know About
Make a Sunflower Craft Using Noodles - Fun spring or summer art project for kids! | CraftyMorning.com
Canvas Art. Quick DIY, doesn't look hard at all. Wonder if it would work on an art journal page also.
Wind chime, great craft for kids. I will use ensure cans and add a little to one or two of the cans
Soup can bird feeders. Cute for recycling! And a kids craft. So many possibilities