If you want someone will create signature design for you, you can pm users in this list, all there designs looks professional, you can see also there previous work there https://bitcointalk.org/index.php?topic=1610428.0
Or you can create a contest calling those designers to make some designs for you. And you need also a manager that will manage that campaign which you can see here https://bitcointalk.org/index.php?topic=1303430.0.
Anyways good luck to your future campaign.