I need a Twitter header image file

I need a twitter header image to compliment the fox logo we have. The business brand name is CloudFox. I already have the fox logo so want 2 to 3 clouds to sit in the header. The clouds will be a solid white with blue text, the hex value is #003596 which is Pantone 661-C I believe. I can provide the text for the clouds. I would like the word CloudFox to be in a larger font that the other words though. I like Impact as a font but am open to suggestions too. We have 2 sides to the business so I think we will need 2 header files with the same cloud layout but with different text.