This is a pretty quilt and would be fairly easy to dissect to figure out how to make it without a pattern. It's just a series of squares set on point. Definitely would need a design board to keep everything straight. I rarely use a pattern as I really enjoy the figuring out process. I'm not a prolific quilt maker because of this because of the time it takes and I'm sure with a pattern there are faster ways to cut as well. That's OK by me because I'm in it to have some fun rather than set records.
I do understand the frustration on Pinterest however as I look at images there at times.