I'd be interested to see what comes out of this...
Other people have mentioned Intellipad, which ships with the Microsoft Oslo SDK, and that certainly has some nice visuals. It also uses WPF, which is very skinnable, from what I understand. I don't suppose you're writing on .net managed C++? I'm guessing not.
I think the visuals are a very distinctive aspect of sublime, and they're the reason I'm using it rather than one of the more pedestrian editors. Y'know. Where the name is regex matches /(ultra)?(edit|text|note)(pad|mate|ed)(pro|plus)?/ and they are keen on their grey toolbars.
All this is a long-winded way to say; I have no artistic ability, but I like it pretty