CraftProjectIdeas.com has art supplies and activity kits suitable for preschoolers to tweens and can be found in the kids craft aisle at Wal-Mart. They have a great selection of products with fun ideas for all different occasions as well as just for fun crafts.
My preschooler made the heart caterpillar and I helped my toddler create the heart snake. My daughter adores the little gems and the fact that they are stickers! Using white school glue, I wrote on their projects and the kids shook the glitter glue over it. I love the glitter shakers because they are a great quality and aren't too messy for even my 2 year old. They are petite enough for her to hold with only a few holes for the glitter to shake out from.
There are pictures of the heart flowers for the kids to look at and try to copy. The stems are just strips of green construction paper.