"Maybe I’m simply a total failure at The Google(s) and The Bing(s) but I went looking for the list of standard icons for Windows Phone 7 (WP7) and couldn’t find it anywhere.
After a ton of hunting, I found the icons in C:\Program Files (x86)\Microsoft SDKs\Windows Phone\v7.0\Icons. [GD: If you're running x86 Windows your path will slightly different]
I find that funny in that I'd have never thought to look for WP7 icons on my hard drive, that my first step would be to search the web (and my related past posts). I mean icons on our local HD's, who'd have thought... LOL.
What's in the vector folder?
... an Adobe Illustrator file which imports just fine into Expression Design...
Related Past Post XRef:
A couple of my favorite things... Paint.Net and Windows Phone 7 (and using the one to create App and Tile icons for the other)
Sometimes a picture says… Photoshop Design Templates (and other design resources) for Windows Phone 7
Application Bar Icons for your Windows Phone 7 development
A Windows Phone 7 Development/Design Guidelines/Certification Requirements Cheat sheet/Checklist
The Noun Project, XAML’ified… or The Noun Project converted for you to XAML and PNG’s
“The Noun Project” + SVG + Free + Metro like look and feel + 500 = Happy Windows Phone 7 Developers