Here is my version of a temperature blanket. It’s not so much a pattern, more like my notes. ;)
I wanted a pattern that wouldn’t end up to be 10 feet long! I also wanted my blanket to be soft, not stiff, and have a good drape. I think I came up with a good solution. I adapted a standard temperature blanket pattern to fit my needs, and maybe it will help fit yours, too.

https://catsdancingtoo.blogspot.com/2019/01/claudeys-temp...

Edited to say that when you the sc rows, you should do the st thru the front loop only (flo). That’s what gives the ridged look on the back side.