I worked up a few ideas in EQ7. I happen to be working on a variation of Omigosh myself (replacing the Shoo Fly block - so the version below looks slightly different). My EQ7 versions don't have as wide a variety of color as your quilt or mine, but it gives us a general idea.
1st pic is with a piano key border ... I think it's very distracting (oops .. I forgot to add a white inner border, but I don't think it will help much <g>).
2nd pic is with a diamond border ... slightly less distracting
3rd pic is with QuiltE's suggestion of using the double 9 patch in every other block around the border to extend the chain. Of the three ... I like this idea the best!!