This is an easy and cheap industrialish picture/poster frame I came up with a while back - it uses 1/8" thick 3/4" wide flat aluminum stock and some little alligator spring clamps; all of which you can pick up at Home Depot and the like. I've used this on larger (20"x30") pictures but here I'm showing some smaller prints, whatever the size the method is the same.
Step 1: Parts
4’ of 1/8” thick 3/4” wide flat aluminum stock | Home Depot, etc.
Alligator spring clamps | Home Depot, etc.
Parts cost - ~$13.00 | enough to do 3 8”x10” pictures
Note: the picture that is being framed is a slightly modified version of this iStock vector illustration.