Before I went to the frame store I wrote down the sizes of the inserts and bought the frames to fit the inserts. I had to trim a few of the inserts, which are cardboard-backed felt, to fit perfectly in the frames. Some of the larger frames contain more than one insert--whatever would fit the size (example: four 12" x 9" on the long frames) Here's a link to Cassidy Frames site:

http://www.cassidyframes.com/parts/parts.html

My wall of chips in my home office is actually the result of a negotiation with my wife when she wanted to add another kitten to our household. Since she was giving me full permission, she helped with selecting the frame style and arranging them.