I always use Duncan Hines cake mixes . I have a wedding cake to do and they want it to be a confetti cake .Does anyone have any suggestions or things that they have used already. thanks very much for your help.

Although I've never done it, you can use your white cake recipe and stir in multi-colored jimmies (NOT nonpareills) at the end. They soften and break down, leaving color.

If I'm remembering correctly, IndyDebi did one with just pink and green jimmies for a pink and green wedding.

Edited to add photo link:
  http://www.cakecentral.com/cake-photo_1156785.html

Dawn is right, I did. My cake supply store ordered the jimmies for me and they are a CK brand. It worked great! What I would do different is add a little at a time. Even a quareter cup of these things are more than it looks.

Here are a few links:

http://www.bakingbites.com/index.php?s=jimmies
(scroll down)

http://cupcakes.today.com/2009/05/18/tie-dyed-cupcakes/

Just sprinkle some rainbow nonpariels into the batter -- voila! a confetti cake! That's what I do!

thanks for all your help