Throwing in another idea for you, ShelTluvr... being that you said you like florals ...
How about a small floral print that reads light (or even white) for the background? Then for your chains something with more oomph, to ensure contrast, so that the chains sit up nicely against the background print.
And oh, don't forget the backing ... could be the same as the background fabric or a larger floral print, that works with all.
WMUTeach suggested an ombre. Similar but different, there are some nice batiks that will give you variable colours in one fabric. Or look for some of the blenders that have shading within them, as they too can be quite show and give the colour variations, along with some movement.
Your quilt can certainly be feminine and adult'ish ... and not childish!
ShelTluver ... ENJOY the journey!