Yep, it's time to walk away for a while. If it's at night, I go to bed or go 'veg out' somewhere until bedtime. If it's during the day and I have the luxury (LOL) I try to lay down for a few minutes in a quiet area. This gives my body and my mind a rest. If the only thing I can do is obsess about it even if I've walked away sometimes I will go back, lay it out on the table or floor or a bed in another room, walk around and look at it at different angles and if that doesn't work ... start going through my stash again, but for therapy not looking for something. It's amazing what fabric is hiding until you start sorting and touching and fondling (LOL)!
Why not post a picture of your quilt and border and see what we folks think. If there's one thing this group is, we are honest about our opinions!