You can add setting triangles of an assortment of prints or just a single one. If a single print, then maybe adding that one as solid squares several times in the quilt to tie it into the edges. To make it old fashioned, use white or cream setting triangles, a small stop multicolored border (about 2 inches) and then white again as a larger final border.
To modernize it, find a black with white print and make a secondary pattern within the quilt by putting in some solid squares, then use the print for your setting triangles, a stop border, then the print again.
Or sash the whole thing with the color of your choice, but I wouldn't use one you have very much of in the quilt. That would end up making everything flow together when you want it to stand out. Then use the same color for your setting triangles.