I want to add custom themes to my MU install - themes that

I want to add custom themes to my MU install - themes that will match the industry that the network will cater to.

The ones I have found are either from ThemeForest, and cost 40-60 per single use license, or they are free and I wouldn't trust them to be error-free/virus-free/upgradable.

I suppose I could go through our themes and change the images. But I would also like to add some things to each theme, for example a page or widget or something that would display business hours, plus some other industry-specific stuff.

Do we have plugins for this, or does anyone have any suggestions of the best way to go about this?

Thanks!