My son's 2 year Birthday Party was difficult to pick a theme because when he likes something he LOVES it and this boy loves a lot of things. That is when I decided the perfect theme for him would be a Harris' Favorite Things Party and we had his favorite colors and toys and food.
It was a blast. It is the age when they are just starting to figure this whole Birthday thing out. I still print out his invite for him to carry around sometime since it has a Garbage Truck on it...his current love.
Favorite Things Birthday Invite