For anyone looking for the best online resource for Yo Gabba Gabba party ideas, this is the best site I have found so far. They have everything you could need for planning a Yo Gabba Gabba party.
You can find links to Cake ideas, Games, Party favors, Printables, Decorations, Invitations etc..
This is your one stop shop for all ideas related to Yo Gabba Gabba party. They even have user submitted birthday party pictures and stories from their own childs party. Great Site!!