Today I just opened a bag of foam stickers and gave Sebastian a piece of paper and let him go. Some ended up on us, some on the paper and alot on the floor! It was a lot of fun just watching him play with stickers.
We also worked on body parts with them (which he pretty much knows all the basics anyway, it was a fun way to touch on that topic though) I'd say "can you put the sticker on mommy's nose?" etc and he would, lol. Lots of fun!