I in no way shape or form am any kind of expert. Still technically a newbie at the whole quilting game (less than a year) but I see a braided type border...in the blues and purples. I think it would frame your beautiful work nicely, and pull your eye away from the yellow a bit. I'm probably wrong on the WHY I see it that way LOL...but I still think it would look nice.
It really is beautiful, it will definitely give your friend warm happy feelings of her daughter when she sees it. You're doing a fantastic job!!
Keep us posted please :)
PS I knew I'd find one here...like this one that Quilting Turtle did on Dawn's center for their Round Robin. :) (hope you don't mind me borrowing your post Tricia!)
http://www.quiltingboard.com/posts/list/345/6017.page