Since the visual impact of your Twitter background is the strongest tool you have available, customize it to give people an eyeful of who you are. You can make your own image on your computer and upload it under Settings - Design - Change Background Image. The first 200-250 pixels width on the left hand side is a great place to put additional profile information and list websites.

For a quick solution, you can create just the sidebar (250×700) as your background image with “no tile” selected. Then, modify the rest of the Twitter color scheme to complement it. You can use the first 200 pixels from the top for your picture or “header” for a possible logo and tagline.

The rest of the 400-500 vertical pixels should be used to tell others what you’re about and most importantly, what you’re looking for. Are you using Twitter to get business? To gather ideas for a project? To get feedback from customers?