Many members offer design services. you can find some of them by just scrolling down in this board.
This topic contains almost all of them : Overview of Bitcointalk Designers(Signature,Avatar,etc) It was last updated last year.

I suggest the services offered by Zwei ; he makes wonderful designs + cheap prices : 🔥[15$]🔥 - ⚡ Zwei Signature Design Service - ✨