Like your effort and colours. I think it could look nice if you combined all of the scraps from the inside of your quilt and made them into a binding strip. You would be killing two birds with one stone: Get rid of the scraps and add all of the colours to the binding.
As for the quilting, in my opinion, it is harder for a beginner to be accurate enough with SID than it is to do FMQ. Why not attempt a simple diamond grid pattern in the borders? You will need to make sure you alternate the direction of your sewing so that your quilt does not skew in one direction. What ever you decide, make sure you have a practice sandwich to do all of your experimenting on. All the best.