I don't know if I'll get it done this weekend but on Monday I'll post what I got.
Here's a sneak peak (using two different variegated threads!) of the back:
I couldn't decide between the two colors so I used them both (King Tut Daybreak (light) and Paradise (dark)).
I did ~organic~ concentric arcs. They are organic because I wasn't very good at following my guidelines, but my harp space is like 6.4" so I think I did pretty well.