Custom WPF Bitmap Effects, authored in a Managed C++ assembly, complete with sample project to help you roll your own. It works, complete with live preview, in Expression Blend. Done by a guy called Rob who has a blog called Run To The Hills. ‘Nuff said.
Check it out!
p.s. My suggestion to Rob: [...]
I’m currently consulting independently for a team of developers and designers. The process has been a joy, both for me and for my clients. In part, it has shown me that Blend (2.5) has matured to the point where it delivers on the promise of dramatically improving the developer-designer workflow.
I had the good fortune [...]