I'm still being outvoted though :)
Well, as the question is asked, yes.
I mean, Tom is working on the theme for scirra's website. This means, this is your image, what you want to reflect to the user. When we (members of the community) arrive on your site the theme makes us feel this and that way, because of the colors you choose, the arrangement, etc...
As mentionned earlier in the discussion, you could provide different themes/variations of colors, and let the user pick the CSS he likes best. Maybe even customize his own css for his own account (is that possible ?).
If you have but just one theme, you won't be able to obtain a 100% approval by the community, because of all the tastes and the number of users. In this combination there will be at least one person that won't like the color, the way things are arranged, etc...
So either propose different versions, or just propose one, which is the one version you picked, because, in your tastes and opinion, it represents the image you want to give out from Scirra.
On a personnal note, I like the blue version, but I like also the green current one. The "greener" Lucid's theme is even more harmonious, hence better, so it might be a good alternative too.
In the end the multiple choices option would be cool, and could allow me to switch the theme of the site when I grow tired of the current theme (a bit like I'm changing my desktop's wallpaper every 6 months or so ^^).