By using an array of primary colors, posters of musical instruments, and lots of balloons, you can easily create a Little-Einsteins-themed party.

Here are some ideas:

Solid-colored-plates, cups and party hats.

An artist's easel placed at the door with a "Happy Birthday" sign.

Balloons with musical notes on them (if you can't find them pre-printed, draw notes with a permanent marker on blown-up balloons). You may also try uniquely shaped balloons. After all, Annie loves balloons and so will your preschooler!

Disposable cameras letting the children be photographers for the day!

Streamers, which you can hang all around the room. Try printing and cutting out multiple pictures of Rocket (available here), which you can attach with glue or tape to the streamers.

Lots of musical instruments placed around the room such as kazoos, horns, drums, and plastic guitars. (Pots and pans work just as well.) Encourage children to play music using the instruments.

Print out our paper placemats here. Customize by putting each child's name on one.