I really like your block pattern. I think it needs a solid border so your eye can stop and enjoy the quilt top. With pieced borders your eye just keep traveling around and around and never really stops to enjoy the wonderful blocks of the quilt top.
On my scrappy quilts I like to add a solid narrow border, then add a wider border of a small print that appears solid.
The narrow border is like a mat on a picture and the wide border is like a frame on a picture. These borders hold your eye
to the center of the quilt. A lot of work goes into making a quilt,
make sure everyone can 'see' the great work you have done.