Just a tip a wanna share.
I use Holo Launcher HD instead of TWiz Magazine i removed.
But impossible to have a beautiful wallpaper with great HD definition. Crop tool blurs my wallpapers everytime.
So, to have something great to fit this great screen resolution, try this tip.
Download Simple Image Wallpaper from Google Play :
Define a 2560*3200 image, but only the middle will be displayed !(center your 2560*1600 image in the middle of your 2560*1600 image). Wallpaper will not scroll.
Find Simple Image Wallpaper under Animated Wallpaper (Long press on home screen)
Define your wallpaper.
You've got hi res wallpaper now !
Here's one of my favourite sample :
(Right click on computer, save as...)