I'll have a look. Although I didn't have a huge problem finding random image/abstract/artsy backgrounds, I came up somewhat dry-ish looking for anime style backgrounds of decent quality for my resolution/aspect. I'm fine with nice non-anime images, but sometimes I'm just in the mood for something else.
AnimePaper as an alright selection for anime ones, and if you're feeling adventurous and/or risky you could delve into 4chan's /w/ >_>
And so not to have wasted a post, mine. xD Odin and Mog.
Can you tell me what anime is that Odin wallpaper form?