Twitter background and facebook cover

i would like a:

1 tiwtter background - setup correctly for different screen sizes etc
1 facebook coverpage/timeline

this is for a startup food brand. All pictures woudl be provided but some artistic flair from you guys would be needed for it to be a custom and highly imaginative design - in keeping with my website ofcourse.

I have checked several hourlies/per hour websites but trust pph so am going with this here.