Agreed. More sites need to move away from the default styles and should use Bootstrap for what its great at being -- a structural foundation.

I run a little marketplace for Bootstrap themes called WrapBootstrap - http://wrapbootstrap.com/ - I just sold the 100th theme today so more people are taking customization seriously within the Bootstrap community than before.

You can also check out Bootswatch - http://bootswatch.com/ - He provides free color themes that you can use to skin Bootstrap with.

People should definitely be using Bootstrap for its technical merit and not for its default styles.