I'm not great at using Photoshop but, here is my attempt at making a background for my devices and I thought I'd share. I shared the folder below on my SkyDrive account so please feel free to download any of the images. There are 5 different sizes, 1920x1200, 1920x1080, 1280x1024, non-retina iPad size and iPhone 4S (and older) size.
https://skydrive.live.com/redir?resid=E1898E4A2569E568!4714
https://skydrive.live.com/redir?resid=E1898E4A2569E568!4714