Watson

This is an art quilt that I've been working on for some time. It represents a journey through betrayal and grief. I did it in the confetti technique, except with larger pieces moving down to smaller pieces across the quilt. Quilted it on my long arm.
Now, I need to finish the edges but I am not sure how.
I was going to square it and face it, but I think I'd like to leave the solid fabric around the outside and somehow make some of the edges a bit ragged or uneven starting on the black fabric and then making them more whole as you travel towards the lighter fabric. I am at a loss on how to do this, however.

Any ideas appreciated.
Watson

PS...it isn't oriented correctly. The darkest part should be on the bottom left.