My personal opinion is that black and indigo won't give you enough contrast. I would go with either black and tan or indigo and tan. I keep thinking the the black and tan could be an interesting combination. There's a pattern I'm thinking about for my next quilt. You can either cut a charm in half or a layer cake in half and then frame it. Than you could either sew them side by side or even set them on point!

Pam in Vegas