So, you want to take your Twitter account to the next level – specifically, by taking the background design up a few notches.
Twitter gives you the option of selecting a ready-made theme, changing the background image completely, and customizing the design colors for the background/sidebar/links/text.

Twitter Background Design
The right option for you depends on what you’re using Twitter for. If you’re just testing it out to see if you want to continue using it, then stick to the background images that Twitter provides.
Custom Twitter Background
If you’re serious about using Twitter and you tweet frequently, then you’re going to want to continue developing your online presence. You need a personalized design that reflects your brand and and enhances your profile. In this case, you want to customize your design.

Inspiration: Twitter Backgrounds Gallery
Use Twitter Backgrounds Gallery for inspiration from some of the top bloggers.

Free Twitter Background Templates in PSD format
Download free Twitter background templates in PSD format. This website offers 5 free templates for download. This gives you the basic layout and allows you to customize the colors and images.

Twitter Background Dimensions from SmashingMagazine
For the graphic designer – Smashing Magazine provides a rough template for Twitter background design. Keep in mind that your design will appear differently in different sized monitors.

Twitter Background Design Template from Adobe Tutorials
Adobe Tutorials writes a great step-by-step article on designing your own background image.

Twitter Background: Step by Step 'How To Design'
Final word about Twitter backgrounds: All images must be smaller than 800k. GIF, JPG, PNG.
Good luck designing your new Twitter background
