OMG - would be beautiful!!! You'd have to have a nice bright fushia and a soft lavender. If you dressed the bridesmaids in these colors, I would recommend using different colors in your flowers - maybe some soft blue or yellow. I'd go to a craft store that has lots of flowers and just play with some colors to find something that will be pretty.
Also you may want to have one dominant color and one accent color. That way you don't run the risk of having a kind of 'visual chemical warfare' in your photos, but still have a bright and beautiful look.
Depending on the shades, you could have a rich, juicy palette with these colors, or a brash, clashing effect (like an 80's fashion nightmare). A great tool for custom color choice is the paint section at a hardware store. Pick up chips in the colors that appeal to you, cut them out and try different combinations until you get what you want. If you still have trouble, try a wedding planner. Many offer theme/decor consultations. Good luck