Of course there's plenty of free wallpapers out there, but if you want to make them yourself here's some info you might find useful.
Resolution
the G1 display is 320x480 pixels (portrait mode), but then of course you have three desktop screens to slide between left and right.
These screen are not side by side though, they overlap.
The overall wallpaper size should be 640x480.
Here's a visual representation of how the desktops overlap
Click it to view this Jpeg in full resolution. You may find it usefull as a guide when making your own wallpapers to see where they'll overlap.
Alternatively you can download the Photoshop Template i built here Photoshop G1 wallpaper template.
When you've built your wallpaper, save it as a jpeg and email to yourself at your Gmail account.
Easily pick up the email on your phone and save the attachment, it'll save by default to your pictures folder.
that's it, Have Fun!
