I would frame it with one of the dark colors

Depending on how wide you want it, I would add the lighter yellow first, then the purple. You can vary the width, depending on how big you want the quilt to be, but try to do it in multiples or halves of the orange border you've already used. For example, if the orange border will finish at 3", make the other borders finish at 1-1/2", 3", 6" etc.

fantastic quilt top great job

Great Dresdens Plates. I think the last border should be wider for balance of the inner dresdens

It looks really pretty! :)