It was a Peanuts/Charlie Brown theme. I couldn't find anything Peanuts at the party store! So, I went with yellow decor with black zigzags instead. Here are the favor bags and the decorate-your-own cups, for example:
The kids (and adults) had a blast with decorating their cups!
Decorations were kept simple, using red and yellow:
For the food, we had various Peanuts-named/themed dippers and dips, since most toddlers just love to DIP things!
Then, we had some fun Peanuts-themed desserts and drinks, too!
Thanks to the help of our family, it turned out great! And our little one had a blast!