Thanks to a tip from Rob Cameron, a fellow Architect Evangelist at Microsoft and who has a nice list of WP7 blog posts, I see there’s an interesting resource for those designing for WP7. Properly named Design Resources for Windows Phone, this MSDN page has several goodies that your designer will appreciate:

 

The design templates look to be a good resource for true designers. Consider this summary:

A collection of 28 layered Photoshop template files that can be used to create pixel-perfect application layouts, to help guide UI development, or to pitch an idea. These design templates showcase many controls that are a part of the Windows Phone Developer Tools Beta. They also include examples of controls that are a part of Windows Phone, but are not available as a part of the Windows Phone Developer Tools. These additional templates are included to help designers and developers maintain a consistent look and feel across applications for system controls that developers wish to mimic. Templates in the download: Application Bar & Application Menu, Buttons, Check Box, Context Menu, Date Picker, Dialog Boxes, Edit Control, Hardware, Icons, Keyboard & Input, List Picker, List View, Panorama, Panorama Backgrounds, Picker Box, Pivot, Progress Indicators, Quick Jump Grid, Radio Button, Reminders, Slider, Start & App List, Start Tiles, Status Bar, Theme, Time Picker, Toast Notifications, Toggle Switch