I've just posted a message to the haskell-cafe discussing possible changes to the Haskellers theme. Here's the message in its entirety. I encourage you to respond on the mailing list if you have something to say:
* How important is adhering to a "standard" look?
* Which theme is overall more visually appealing?
* Which theme gives a more professional feel?
Please note that questions 1 and 2 may have different answers. Keep in
mind when evaluating these themes, especially the first, that it is
*not* in finalized form, just an basic idea of what could be. A third
option that I have not pursued yet due to time constraints would be to
leave the layout as-is currently but replace it with the Haskell color
scheme. Yet another option would be to take the second theme mentioned
above and try to force the Haskell color theme on it; I don't find
that a good idea. Options 5 and 6 are leaving the site as it is (both
layout and design), or proposing a totally different layout.