There was a similar one, to try to reproduce clouds shown in a photo. That seemed to be a tough one and only a couple folks attempted it. If we can find a good (copyright-free) photo to work from that wouldn't be too difficult yet still be challenging, I'll bet it could be worked in some month. Gotta wait for things to settle down for Mike, because I'm not sure anymore how he's planning to work the VC and the Theme Sub-challenge. :)