I don’t know why, but all of a sudden I’m stuck on Twitter. I have found a ton of great twitter pages that have been customized with great backgrounds. I was inspired to design my own background after seeing a ton of excellent designs.

There are some designers you can pay to design a background for you, but if you want to design your own, here are the guidelines.

File Dimensions: 2048 px by 1707 px (no clue why i used these dimensions but I am sure I knew what I was doing at the time)
Branding Dimensions: 80 px by 587 px
Coordinates: X=20, Y=14
Horizontal position: 20 px from the left (give yourself some padding)
Vertical position: 14 px from the top (will line up your graphic with the top of the twitter logo. our eyes like symmetry) File size and type according to Twitter: “Images must be smaller than 800k. GIF, JPG, PNG.”

Uploading your background
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Change Default Background: Login and click ‘Settings’ >> click ‘Design’ >> Select ‘Use my custom style below’ radio button >> Upload your image

via Croncast