To change the home screen of your Android tablet and make it unique, you can download HD wallpapers and add them for personalizing the device. I have tried some of amazing wallpapers from Google Play store, most look horrible and not in HD except Wallpapers HD by IncredibleApp.
Wallpapers HD is what I am looking for for my Nexus 7 and Galaxy S2. All wallpapers are gorgeous with great quality and fit with the screen dimensions automatically. The app includes many categories (abstract, nature, flower, sea, sky, animals, beach, texture, vintage) and has search function for by colour.
I load pics on my tablet fast and scroll smoothly, without sluggish. Better than other background apps. Wish it could sort by day or key words in each category.