NSBR: non-toy gifts for 3yo boy

[iJenny]

Ok, I need some help. On Nov 1st, my "baby" is going to turn three years old.
I don't want to get him any toys for his b-day because 1) we have way too many toys aready and 2) the grandparents/aunts/etc are going to get him plenty of toys.
So... I need some suggestions for non-toy gifts.

I know that I'm going to get him some fun Playdoh stuff because he LOVES playdoh. And I"m steering away from books because my boys have about a million books.

Any suggestions? Anything he just simply can't live without?

Oh, and I should put this disclaimer: when I say "no toys" I mean very typical toys like action figures, trains/cars, etc. I'm not opposed to getting him some cool toy that is exciting and different and will get a lot of use out of (like a play kitchen for example)