If the quilt is large enough for you already, skip the border and use some of that solid orange for the binding. It will still frame it nicely without taking away from the interesting pattern created by the scraps.
edited: Sorry, I could not get the images to show up directly on this page, so gave you links instead.
Here's an example of my scrappy quilt. Borders would have taken away from the pattern that was already created.
http://pic20.picturetrail.com/VOL252.../147468413.jpg
This one, made for my sister, is the closest to wild colors as you have in your quilt. It could be done with or without a border. However, it was never going to be on a wall and adding the border for a quilt always on the bed wasn't necessary.
http://pic20.picturetrail.com/VOL252.../207734943.jpg
Some quilts just don't look finished without a border. This one was originally going to only have that red as binding. It just didn't look right despite the fact that it would only be on a bed. So I made it a double border and was much happier with it.
http://pic20.picturetrail.com/VOL252.../147468414.jpg