Hopefully you have made the decision by now. For my eye, I think this border looks just fine. I thought it was blue but others kept saying "brown" so I thought maybe you should change it to a blue. Since it is actually blue and some of that fabric is in the center of the quilt and you have the fabric, I would most definitely go with it. Sometimes we quilters over think a decision and it freezes us up. I know that has happened to me ... a lot. I am sure there are a lot of other perfect fabrics out there to buy that would/could go with this quilt if you made one again but you have a usable fabric so I would go with it. Go with your gut feeling, finish the quilt, them move on to the next one. What is it others have said ....... "Finished is better than perfect"!