I love your blocks! Isn't it interesting to see how they turn out when you get to sewing? It becomes addicting to add more--and more--and more until the fabric runs out. I'd use a coordinating fabric cut into 1/2 square triangles to create a square block for finishing. This would set your blocks apart a bit and let each one "shine" on its own. Be sure to make the triangles a bit bigger than necessary so you can accurately square up the block though! Beautiful work