There are lots of wallpaper websites out there for manga and anime. Though, through some self experience, I've found that most of them are NSFW. So, i'll just list a few good ones that I know of.
Konachan.com
Animepaper.net
Minitokyo.net
These are the ones that I use anyways. I don't go on them exclusively, I just go on them when I want a random wallpaper or something. It'd be much better to find out a wallpaper maker that you like and Google search that wallpaper artist. Then you'll have wallpapers that you'd (probably) like from the artist that you like.
You can purchase Dragonball Z manga and anime decorative wallpaper for kids from the amazon shopping website on behalf of the company known as DesignToRefine.
the website in where you can change your patch wallpaper and champion skins are leaguecraft.com
Linux wallpaper can be downloaded off the internet from an interior decorating website. Linux wallpaper can also be downloaded straight from the Linux manufacturers website
manga high is a students website.
For "real life" wallpaper, Home Depot and Lowes sell map wallpaper, along with the website paper-source. For "computer" walpaper, as you can basically set any image as a wallpaper, you could buy a world map wallpaper at an image collection website (Masterfile, Corbis).
manga.animea.net is a website where you can download episode of manga and read manga for free.
youtube
Onemanga.com is good. Loads of manga series, and little to none in ads or viruses.
Some of the places to download John Cena wallpaper are Desk Top Nexus, Karthik Bteck Blogspot, Hdwall Papers Best and Entertainment Wallpaper. There is a nice variety of wallpaper to choose from.
www.mangafox.com iz a great manga website.... has alot a manga u can read for free! There is also a website called www.onemanga.com that has tons of manga you can read online for free. I use it personally and i think it rocks.
You can read it at mangafox.com .
You can read the manga at this website; mangahere.com