I like the Monotone theme. I use it in http://noticeboards.wordpress.com
But some possible improvements:
1) Make it possible to add widgets (in a one column format UNDER the picture?).
2) Make it possible to make the comments fields less obvious (maybe part of (1)).
3) Navigation to pages apart from Archive and About.
4) An option on the Archive page to see all posts (not just this year's).
The blog I need help with is noticeboards.wordpress.com.