As my daughter being a big fan that she is we already had the soundtrack ready to go. Ipod playlist & little player, check!, Even a "Happy Birthday" from The Ting Tings, but the party stuff was another thing. So hopefully my searching and making helps you have a easier process.
The biggest thing I can first recommend to you is check out Gabba Friends! It's a awesome resource for all us mom's trying to make a theme out of not many store items. They were a HUGE help in offering clip art for invites. They even have how to do Gabba Character wrapping paper. I wish I had a image cause I made a Muno bag out of a red target gift bag. It was so easy & awesome (just think eye & mouth, just black & white construction paper an a glue stick). They even offer how to's for Invitations. This is what I came up with using their clip-art link an a little Photoshop:
I drew my pool & tried to hide Riley's sizing info under the pool just in case some people wanted it was there. I tried to take the lyrics & tie that in with a simple fun invite. Paired it with a nice bright yellow envelope & a YGG sticker to seal.
The cool thing about YGG is they have basic bright colors to work with as a base. If you are like me, it was way cheaper and easier to buy the right paper plates without blowing budget. I don't really care for the one time use, perfectly matched picture deal items. I hate being stuck with leftovers that look more like money reminders then party fun, like these: YGG 1st Wish Birthday Deluxe Set. It's great don't get me wrong, but for the $, not my thing. So seek out the colors that match the characters save yourself some bucks.
Now to think how to occupy those little ones. Besides the obvious summer stuff, of the water table, bubbles & pool. I wanted something extra. I was soooo happy I did cause this was the one year it happened to be freezing! So the indoor ideas were very handy. We had a little craft time of making Foam Visors. I found them super cheap at Shindigz.com and keep my eye out for sells on foam stickers. Glitter, non, letters, numbers, shapes, a fun mix goes a long way. No matter the age stickers are easy and not really a clean up issue. I bought a pack of plastic glad like tubs from a dollar store and made it so there was enough of a mix so kids wouldn't fight an stickers wouldn't be all over. It was very easy to close the lids & hide when all done.
We posted Yo Gabba Gabba Safety Zone Signs (free Nick Jr Print) every where so kids knew where they could go. Had a big happy Green - Safe Zone sign on the door to the set up a play room. In it we had all of Riley's toys & YGG dvd's playing on a tv. Best thing for the little ones was her Yo Gabba Gabba Dance Mat. I actually drew inspiration from that for the inside top of our Super Music Friend Show Player.
Kids had fun playing with little character action figures in there & posing for pictures. It became a great little play house for my daughter long after the party.
The food was easy to fit the theme, the song even tells you some sides, "HOLY GUACAMOLE! We've got chips" so I went for the BBQ, summer picnic feel. Easy & yummy. But when it came time for the cake, a lot of the things offered weren't exactly what I wanted. I mean for the price they charge I want it to be something my kid can keep & play with not some hard plastic with a sticker. So I searched around. She already had the hard plastic action figures, but I keep thinking with their weight I couldn't really guarantee them not falling over or into the cake, then finally Yo Gabba Gabba Bath Squirters! Fantastic. Light colorful & she can use them in the bath or her outside water table! I found a great music theme cake & fit it right in. It was soooo awesome!
OK, I know not all parents subscribe to the idea of goody bags, but I love them. So ebay had great deals on little stuff like Gabba Stickers & tattoos, but I found some really cheap & neat stuff of the Shindigz site. Besides the foam visors from the craft mentioned above, I found sunglasses & beach balls. So do your research and sign up with them or other party sites cause you never know what you will find or what kind of coupons they will offer. They seem to always have some deal & I was very happy to apply it to their already great prices.
Even the adults seemed to enjoy. ;)
Just remember LISTENING AND DANCING TO MUSIC IS AWESOME!!!!!