Microsoft has finally updated the images/icons that ship with Visual Studio. Hooray! Unfortunately, I don't have a magenta filter in my brain, so thumbnail view in Windows Explorer doesn't work well for me. You can view any images as icons with this app, but it was made specifically to view those included with Visual Studio 2005. Because of that, all icons are shown as 32 x 32 ("large icon mode"), all bitmap images are shown as 16 x 16 (since that's their native size) and the transparency is set to magenta for the bitmaps.

Download (.NET 2.0 beta 2)

Source (C# 2.0 beta 2)