my quilt making rule of thumb is borders should only enhance the quilt, never be used to make it bigger
so my question would be, is that the bed you intend to use the quilt on? Or is it a cuddle size quilt?
If bed size I'd add two more rows of blocks all around.
Another option would be sashing and cornerstones, but it looks like it is already stitched together?
or borders with four cornerstones of the block in the quilt, that would make the borders serve a purpose
and bind with strips from the patchwork candycane style to pull it all together.
here is a sample from craftsy, the fourth photo down
https://www.craftsy.com/quilting/art...acks-bindings/