If you don't want children expressing themselves by smearing mustard on the oven door, you need to get them something with which to create. We've got the kits right here, you supply the child, and everything else will take care of itself.
Where would your childhood be without all these? Where? We'll tell you where, NOWHERE. Even the harshest, most bitter, black-hearted Scrooge of a businessman still nods his cruel head when someone puts a sticker on his child's spelling test. You're looking at the great equalizer here. Stickers are where civilization begins.