I am using variegated thread on a blue, green and purple batik quilt. The color of the thread are in blues from dark to light. I'm using the same in the bobin as the backing is blue. So far, it's looking awesome! Two more rows to quilt and then the borders. I'll post pictures when I'm done, but FMQ quilting kills my arm, MS in right arm prevents me from doing a lot in one day - pushing and pulling a queen size gives the shoulders a work out. I'm using 50 weight in both top and bottom - makes it easier to adjust the tension.
When it comes down to it, it's your quilt and use/do what you like. Also, I like to hang the quilt and take a couple of steps backwards. Putting a couple of feet between you and the quilt will give you a different perspective than standing over top of it.
I have never seen a quilt that I didn't appreciate the creators artistic abilities! The amount of blood, sweat, and tears that we quilters pour into our craft allows us to grow a artist.