Now that Pwnage 1.1 has custom boot and restore logo support.. post your .pngs here!
Edit: For those wondering how to make a proper PNG that PwnageTool will accept, these are the requirements:
-320x480 or lower in resolution
-Needs to be RGB or Greyscale
-Needs to have an alpha channel (This means things you want black on the phone, like your background, should be transparent in your image)... If you have a solid image with a black background that you want to use, that's fine, but there NEEDs to be at least a few transparent pixel border around the whole thing when you save it as a png.
-Needs to be saved as a 24bit PNG with transparency enabled
-Needs to be less than 100K
If you're using photoshop, your best bet to keep size down is to use the "Save for web & devices" dialog to save. Hope that helps!
Here is my: