I need a professional facebook cover page for my marketplace app

Industry: Lifestyle/Travel
Kind of design: Facebook cover
Design details: Our App is a marketplace where you can buy, sell and connect to buyers/sellers via chat. They can post their product in 3 steps and would like to portray this on the banner, Snap - Post - Connect . I need a really good design done- and if awarded- we will hire you to do a design every month - to suit festive seasons, events etc

We would like the background to portray all types of products and services, electronics, fashion, cars, property etc
Ideas for the visual style: We would like the background to portray all types of products and services, electronics, fashion, cars, property etc
Preferred colors: as per festive season,
Website url: https://www.facebook.com/pages/i-Want/311515755712432?sk=info&tab=page_info
Website information: marketplace
Extra notes: