"I guess I'll have to start the thread since it doesn't seem like anyone is gonna" edition
Before asking for a wallpaper, reverse image search it. This function is built into 4chan now. Its not hard to do.
Remember you'll get more rates if you rate others.

>Resources for Android, iPhone and Windows phone.
http://pastebin.com/JzWPVMGP - General Resources: fonts, wallpapers, color palettes
http://www.mediafire.com/view/bu0e8ordiw0il3y/banner_tutuorial.png - 'Quick and Dirty' Banner Tutorial

>Android Guides:
http://pastebin.com/G3Zde2ga - Basics and terminology to know for android.
http://pastebin.com/KHk9ZuLF - Read this after the basic/terms guide, and before your "first time post"
http://pastebin.com/86gCz85D - Starting place for a customized android notification bar. Outdated
http://pastebin.com/vuXnm1wi - WebMs made easy

>iPhone Guides: are these deprecated?
http://pastebin.com/qGHi8GRr - Crude iPhone ricing guide
http://pastebin.com/Zzj7aGzc - Jailbreak/theming guide
http://www.mediafire.com/?xptygbsj9eqos56 - Aiko Nation Theme.

>Windows Guides:
http://pastebin.com/nE6F3zVp - thals's /w/ Guide for Ricing&Hacking Windows Phone 7 and 8
http://i.imgur.com/znGGUeT.jpg - Infograph style guide

Welcome to the /w/imt! We are here to help. All anime-related wallpaper and image modification requests are welcome.

TO REQUESTERS:

• Please always do a reverse image search before you ask us for help; iqdb and SauceNao are very helpful for anime-related images.
• Please explain your request in detail. We can't read your mind; every hint helps us get you the image you want.
• Please give the specific image size desired: WIDTH x HEIGHT is the convention when giving dimensions.
• There is a separate thread for vectors. Please take your vector requests there: >>>/w/vector
• This is a SFW board. If you must request a lewd picture, please do warn us before you post the link.
• Please upload and link to an image hosting site such as mixtape.moe; temporary file hosters like uguu.se make the most sense, so use them whenever possible. Please DO NOT use Imgur — it compresses images.
• Please DO NOT add white space NOR stretch/shrink your picture since that makes it harder to work on.
• Please be patient. Your request might be very difficult or maybe the available editors are not interested. Don't take it personally.
• Please DO NOT «bump» your requests.

TO EVERYONE:

• Please DO NOT post images unless they need to be modified or are the answer to a request.
• Please BE POLITE. Try to use proper spelling and grammar.
• DO NOT harass people. HELP when they ask for an edit or let others deal with the request.
• CONSTRUCTIVE CRITICISM is always welcome.

4chan Image/Thread Limitations:
• Images SMALLER than 480x600 pixels will NOT post. (1000x599 or 479x1000 will NOT work)
• Images LARGER than 6MB will NOT post.
• Supported file types are: GIF, JPG, PNG, WEBM
• Maximum resolution allowed is 10000x10000

Thread Archive: https://archive.nyafuu.org/w/search/text/Image%20Modification%20Thread/
Previous Thread: >>2181520

Ghost in the Shell is my favorite anime

Some seasonal walls, now it's winter ?

Anyone got any risky papes like this?

I need wallpaper(s) of Hiiragi Kagami from Lucky Star, particularly with a dark background since it may be shown when Magic Mirror on my rPi isn't showing (or I could use as a background for it.)

I've notice that there isn't an thread on this anime

preferably desktop, this ones are the best I found