Today I spent a long time trying to make my wallpapers not look like **** on this tablet and got pretty frustrated. After doing some Googling, I discovered you can crop pictures to 1920x1408 for the best possible look in both landscape AND portrait. I'd like to share some of my cropped wallpapers I picked up from Wallbase.net now. I'll continue to add more, too. These work very nicely with the default wallpaper setter. Download from the link. Not the pics! Enjoy!
I've added a second optimized wallpaper pack.
And here's a third optimized wallpaper pack. Majority of these use a 1920x1600 resolution so you can decide how much of the top or bottom you want in your background.