First of all, go take a walk and do some stomping and clear your head. Then--I don't know what pattern you're doing, but get outside the "box" of the pattern and see if you can't work with your skinny pieces, refiguring the design so you can still use those matching fabric strips. Could you turn them into piano keys and work them into the (or a) border? You would have to buy new fabric to replace the mis-cut ones, of course. Give yourself license to mess around--something interesting may emerge.