I am making a fondant covered cake for a 1st birthday party. They want really bright colors like hot pink, bright yellow, and bright blue. Any suggestions?

If you have access to Americolor they have an electric colors that are very bright.

Wilton's Lemon yellow, rose pink and sky blue are bright colors.

And Duff, if your Michaels carries it, has a set of electric colors as well.

In addition to those suggestions, I found Neon GEL colors by Betty Crocker at WalMart and my local grocery store.

I used them for the tie dyed cake in my photos for both the batters and the fondant. They worked extremely well and they were very inexpensive.

HTH
Rae