Design Computer Desktop Wallpaper

We're looking for someone that can make us a visually appealing desktop background (wallpaper) for equipment we sell.

We'd need versions with resolutions including:

5K (5120x2880)
4K (3840x2160)
2560x1600
1920x1080
1366x768
1280x1024
1024x768
800x600

Essentially the same fundamental design just to fit each resolution. Our logo needs to exist as part of the design (can be supplied in range of formats from EPS to PNG, JPG etc).

The desktop wallpaper will be displayed on Windows 7, 8 and 10 computers, as well as those running MacOS, so placement of a logo in relation to standard UI elements is required.

We're just looking for something relatively nice looking that follows our corporate colour schemes (we have a document listing these including the various values for colours), but doesn't clash with the operating system default themes too badly!

The type of thing we're expecting is the sort of stuff you see on Dell, Lenovo and HP systems - although something a little nicer would be ideal as they often seem lazily designed.