I am making a wedding cake for next weekend - I had all the white roses done and now the bride wants pink roses instead grrrr - is there any way I can dye the white roses

You didn't say what they were made from. If they are gum paste, you can use petal dust. For buttercream, you almost need an airbrush.

Don't know about dye, but you could dust them.

Everything you ever wanted to know about the various dusts:

http://forum.cakecentral.com/cake-decorating-ftopict-54059.html

....and I hope you're charging her appropriately for the design change!

HTH

sorry I forgot to mention that the roses are white MMF
and no I had not thought about charging her more - I guess I should