Twitter allows you to upload your own background image, so this is a great place to start and an excellent way to promote your brand. Be sure to include your logo, brand colours and any important contact information such as email addresses, phone numbers and other social pages.
Next, Twitter also allows you to upload a custom header image. This is a great area to add a bit of your own branding, but keep it clean, because this is also where Twitter places some of your important Twitter related information.
Finally, you can update your page with your brand colours. This includes changing link colours, text colour and content background colour.
At AB Web we can help you make all of these changes - including creating custom graphics for your background and header.