Seems like a perfect time to go and audition fabric at JoAnn's. I would take the top you have and then take some fabric choices and put it on top of one at a time. If JoAnn's gives you grief, I would tell them your dilemma and that their fabric got you there, what would they do?! I think trying out the fabric under the top will give you a quick idea of what the best colors for borders might be.