Simple construction paper snowmen with snow that could be adapted for many age levels. Shared from Second Grade Nest: Winter Crafts and Currently
I know it's a kid's art activity: DIY watercolor silhouette. (Stickers on first then paint, dry, and remove stickers.) Still, such a good idea to remember.
Spring Kites - White tempura paint with sponges on blue paper for background, cut out kites and decorate, glue on backdrop use markers and stickers for tail
Summer Agamograph Template - Easy Peasy and Fun