One of my favorite crafting supplies is Creative Hands Foam Rubber Stickers. To go into further explanation of this product, these foam stickers come in a variety of shapes and colors. They are stored in 5 oz. plastic containers. The one I have is the letter stickers and the container holds all kinds of uppercase letters and lower case letters. The container does not specify how many letters are in this container and I assume it's because they sell them by weight.
You can make all kinds of crafts with these stickers. Creative Hands Foam Rubber stickers are also wonderful for scrapbooking. Children love these and with summer here its a perfect time to come up with a project involving these stickers. My niece loves these. WARNING: I would caution not allowing very small children to use these as they might choke on them.
These stickers also come in geometric shapes which I also have. The container holds hearts, squares, rectangle, circles, and more.
I know they also to a container of jungle inspired foam stickers that contains flowers, plant shaped stickers and more. To use these you just peel off the backs and stick them where ever you want.
I have found many uses for this fun product