I seen that MMO Champion had a request a sig thread, and thought it might be a good idea for here as well!
Anyone can Request or Request work to make:
Signature sizes vary but I usually do 450 x 100
iPhone or cellphone wallpaper i think is 320 x 480
You can also request Wallpaper, Guild Banners, Avatars, etc.
You can post something like below or what not. If you want something specific, please say what specifically you want!
Char - Armory here
Text - What text you want
Effects - Specific effects?