I have been trying to search for reseller hosting themes for wordpress and nothing! I would love to use WP's CMS as i find it so easy to handle. The second one is Joomla which I really want to keep as last option.
I would suggest you to check some WP designers like Justin Tadlock and Brian Gardner. We have used themes designed by both of them and I'm very satisfied of the quality. One of the themes was released for free use.
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I am having a bad attitude day so keep that in mind.
Why would you need or even want a WP theme for a hosting site? Can you not write html or php?
Not really... My strength are in the selling the hosting plans and discovering best marketing strategies for them. What I wanted to do was to create a WP backed web hosting site (as I only know how to use that) and once I start earning money I will recruit a web designer who can do a much better job creating something special!
I've yet to see one specifically designed for web hosting, but that's not to say one doesn't exist. WordPress Themes are really nothing more than (X)HTML, PHP and CSS, so it's basically a normal design with a CMS/Blog back-end. That said, you could pretty much turn any existing WordPress Theme in to a design that would cater to a web hosting provider, it simply takes some modification.
Try wordpress.org and their forum there are some very good developers there, templatemonster and there are some theme clubs out in the market with some great starter designs - as a hosting company it would either be custom, or you would need to change it up to be you.....good luck