I don't know why I'm bidding on this because you failed to provide any information on the type of banner you would like, but your emoticon indicates you're a pretty happy person, so I thought why not?
I have worked on similar projects to what you are looking for, and I am confident I can exceed your expectations
check these links
https://www.freelancer.pk/u/RScreative1.html
https://www.freelancer.pk/contest/Design-a-Facebook-Cover-333832.html
https://www.freelancer.pk/contest/Design-a-Banner-347760.html
https://www.freelancer.pk/contest/Careers-event-image-banner-354892.html