I modified the dimensions and canvas for the shot of Twilight Sparkle from the new Hub promo because I wanted to use it as the wallpaper on my phone. I just wanted to share it here in case anyone else wants it. The version here is 480x800 WVGA resolution. It should be the right size for many of the Android phones made by HTC, including the Droid Incredible, the Evo 4G, the Desire, the Nexus One, and several others. It will also fit the Windows 7 based HTC Pro phones. From Samsung, it should be the right size for the Galaxy series of phone.
A list of display resolutions for various phones can help you find out if the wallpaper is the right size for your phone.
It's not quite wide enough for the Motorola Droid, and it's not the right size for the iPhone either, but I'll try to upload a version sized correctly for the iPhone sometime within the next four hours or so.
Anyway, just wanted to pony out my phone with Twilight wallpaper, so I figured I'd share it in case anyone else wants it.