I'm making a series of prints that will be displayed and (hopefully) sold as a group. There are a dozen prints, which I plan to make in wallet size, mat, and put in 4x6 frames. My idea is that they will be tiny windows into the world pictured in the photos, and I think 4x6 inch prints in 5x7 frames will be too big for what I'm trying to convey. However, I'm having a problem finding anywhere online that sells precut 4x6 mats with 2.5x3.5 openings, and there are no local stores that sell precut mats in that size. So should I... Make them 4x6 prints and put them in 5x7 frames? Custom order a dozen mats in the size needed? Not use mats, and simply frame them in tiny frames? Any ideas or input would be greatly appreciated.