Here is a Twitter background I made a while back that I forgot to post. Green on a black background. Image dimensions are 1263x800px. If I still have the PSD I will add it.
I remember right I got the brushes from Brusheezy.
Twitter Colors:
tile background unchecked
Background: 000000
Text: 121212
Links: a1a1a1
Sidebar: 3f8b01
Sidebar border: 000000
Example Twitter Page:
