Looks like there's a lot of great stuff on ThemeForest... only problem now is the paradox of choice. Too many good themes to choose from.
There's another site along these lines that used to be pretty good -- Open Source Web Design (http://www.oswd.org/). Unfortunately they stopped updating it several years ago.
See, this is the crux of the matter for me: would I rather mess around with a truly free template to get it looking decent, or pay someone the huge amount of $20 to have it instantly. Obviously, by and large, the latter wins.
I am planning on buying one of WooTheme's Wordpress themes and adapting it into a Django template.
http://themeforest.net/item/freemium-saas-wordpress-cms-blog...
$30 is a great deal if the license covers a single commercial app (I assume you need to buy it each time you use it in an app?) but when do you need to pay for the "Extended License" which is $1500?
http://themeforest.net/wiki/support/legal-terms/licensing-te...
So, most of my sites are written using Kohana and a couple of themes from ThemeForest - one for the sales side, and one for the admin area itself.
Edit: and really, that's nowhere near to being a stupid question - I only found out about options like TF when a friend told me a few months ago :)