A simple yet attractive way to dress up your art is to pair it with a mat. CP carries a large supply of pre-cut standard-sized mats that work with standard-sized photos and art as well as our readymade wall frames, including a few collage mats. Mats begin with an outer dimension of 8x10, accommodating sizes 4x6 and 5x7, and continue up to outer dimension 20x24, which accommodate art sized 16x20.