Illustration required for Facebook Header.

I would like an illustration doing for our project nexmotor.co.uk the illistation is for our facebook page header and should show someone selling their car and someone buying it hassle free. I would like our project logo on their somewhere and the idea should be creative, colourful and clearly show the buying and selling process. I would also like their to be a car on their with a sold tag coming off of it. Please could you supply a rought Idea before going ahead.