I know that a lot of people use the same color top and bottom regardless of what the back is due to the tension issue. I think it is accepted practice but it is your quilt so what ever works for you is the way to go. I do think that once you wash it a lot of those pokies may disappear - also is anyone one else going to be looking at it as close as you are. We forget sometimes that we are nose to nose with our quilt while making it but once it is finished we aren't likely to be that close again.