Do you have a large scrap of a multicolor print that you'd like to use? If so, I find that it makes a good springboard to define your color way. It might have 8-12 colors in it . I lay out my springboard fabric completely unfolded and then audition scraps against it. If it "goes" with that piece, it'll work. All those neutrals HSTs will certainly keep it from looking muddy. And you'd be surprised how a really oddball fabric can fit in.