I think maybe telling us if there's any particular size you would like it would help too. Also, did you want it animated? What color schemes do you like? Also.. Do you just want a banner ad with some sort of changable text on there so you can add whatever text you like on it?
I think answering some of these questions will help out the designers here very much. You are asking for it "ASAP".. The only way for any designer to do that that soon is for them to know the answers to some of the questions above. Basically, as much details as possible to give them ideas. 
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~wfcamb~
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