I tend to buy greens, and any with leaves on them no matter the color. But I have made quilts of varying colors because I made for someone else's idea.
There is phrase in our quilt guild- "you know who the Patritic colors are and who the earth tones are. We are creatures of habit and sew like colors alot.
I would use your stash as a start to a quilt and push yourself to get another color to go along with your stash that would "pop". this may help you get a feel for other colors you will also use. Just a thought.