I have a hard time with colors as well. Here are some of the ones that have sold best for me. I also check out gymboree, gap and old navy's websites then match some colors to their outfits
-pink/brown (mix polka dots and plain ribbon too)
-navy/light blue/moss/light purple (it was a gymbo line)
I also try to focus on what is coming up. So right now I've finished my valentines stuff. Using lots of red and white obviously
and am working on Easter. Lots of pastel colors.