I finally have my G-tablet, clockwork modded and vegan 5.1 first thing, was so simple to do too, albeit thanks for the tips!
Thanks SolidOrange, that Multipicture Live Wallpaper app makes life easier!
Still I may be assistance to others, so you want wallpapers and you want them the right size and you have found one on the net that's awesome, but not widescreen or the right dimensions, etc.
Then try this out... PhotoResize400.exe which you can get from here...
Batch Picture Resize
It's totally free, although you are welcome to donate, it's good software, small self contained (no install) all you have to do is rename the file to what you want it to do...
In the G-Tablet's wallpaper example, download "PhotoResize400.exe" (this is for Xp and Vista, so for other OS's search the site) rename the file to... "PhotoResizeA1024x600IOQ85.exe" (no talking marks)
(For those interested in technical details this file name will make the program, resize a JPG to 1024x600, but it will measure from the centre of the picture and trim the edges off, it won't stop doing it's job for any key presses and it will overwrite the original file with the resized JPG, and it will cut the quaility and therefore file size, down to 85% of the original, if you want 100%, just change the last bit to Q100, in that file name, a whole host of command lines are available, please see website, but this works really well for me.)
Now you can either drag a single wallpaper or an entire folder of wallpapers over the EXE and it will convert them to wallpaper suitable for a G-Tablet! Enjoy!
...Bonus! Wallpaper Site... 4walled
just type in the type of pictures you are looking for! Please be aware this site can be NSFW!