I have been working on my ASP.NET CMS on and off in recent days. The newest big feature will be "themes" much like wordpress has, that can be defined in a single folder, and installed from the admin. This way the current wordpress themes can be relatively easily converted. I still don't expect to attract a big community of designers, but for my internal purposes, this should work just fine.
With the next release, I have also addressed some of the existing bugs and shortcomings, so the CMS should run much smoother.