Frames are pretty boring, I don't much like making em but they take zero time, a shitpost in wood. No real load on them, no technical demands, just cut a rabbet big enough for whatever you're going to stuff in there and make four right angle joints. I often just screw a plywood sheet behind the corners, it gets it real flat and tough and nobody's going to be popping the picture out and replacing it anyway. Maybe one of these little keys over the front miters, to cover the seam

If you've got some cool looking material to work with, just use that, people go bananas If the material sucks, just stick a thing on it. Any kind of thing. This thing was originally a stack of firewood. On occasion, you get one with more complex demands