Originally Posted by Jim's Gem
...I usually go to their registry and find the colors they have chosen for their home...
Jim's Gem's advice sounds the best. In their registry they are surely going to have listed what their bedroom colors will be. That way you will know what colors the couple has already worked out for their home.
Your quilt will be a lovely wedding gift for them.
PS: you could always make a personalized lap quilt for her in her favorite pinks for her birthday, just because or for a wedding shower present!
:-D