Love your colors. Will be looking for your post of the completed quilt.

How bout check out moda bakeshop, there are lots of free patterns over there. Summer squares quilt would be great, Boxwd in is almost the same as your diagram, or add some white and make Sweet Menagerie 9patch, a beautiful pattern, Just some thoughts.

I'd call it "framed squares" Using "framed squares" to search, I came up with a "Little Framed Squares" pattern that's similar to what you're wanting (no affiliation with pattern or store - just the first to pop up)

Edited to add: Can you draft out a pattern yourself? This would be an easy one to do.