OK, I don't know where else to potentially reach a large number of WordPress theme designers (both free and premium) but I have to say it:
Stop with the lookalike magazine themes already.
They all look the same: big graphics boxes with superimposed headlines, big images bulleting every entry, too much white space, serif fonts, etc. Everyone is copying everyone else like lemmings, and has been for about a year. A lot of these themes are mainly about the cool photography in the sample images, not about the structure and usability.
It's getting impossible to find a decent blog theme where text and information are front and center. I'm happy to pay for good themes but I'm just not seeing any out there any more, not even among premiums (in fact the premium theme authors seem to be the worst offenders). Guess I'll have to shut up now, and take up coding.