Here is my latest work on WP7.
Started a couple of hours ago and just finished designing.
Note: Used AAA Logo Creator's Symbols for that
You can use it for General Purpose Design as well as ApplicationBarIcons.Here is the Download Link: Download the IconSet
And here is a sheet showing you the IconSet.
Its fully supported for Light and Dark theme.
Here are the common properties for each icon in the set:
Canvas Size : 48 X 48
Image Size : 36 X 36
Location X : 6
Location Y : 6
I've also tested it myself before releasing:
Dark Theme
Light Theme
Hope it helps,
Have a nice day!