i had created a portal for designer to design & submit iphone retina wallpaper at a size of 640pixels x 960pixels. Currently there is around 200 unique visitors daily around 1,500 page views (Not much at the moment) Will like to introduce this platform to you if you will be interested in contributing any design of your that suit an iphone walls
As a return favor, i will featured your envato user link in a size of 300x250
if you have submit 8 (Lucky number) wallpaper paper, tweet to your friends, and like in facebook of your wallpaper page. I will like you to design your own 300x250 pixel ads for me to featured you on our site for a week. You can add your link on your wallpaper description and i will share it on our iphonebrella fan page [link]
Everyone will have a chance to be featured and the ads is appearing on 800+ wallpaper pages of the portal. Will be in queue basis.
If you are interested you can start uploading just email me @ email@example.com once you have submitted your 8 design.[link]