I’ve updated one of my directory sites so that upgraded listings can be styled a bit nicer than free listings.

Free listings are all virtually the same and show a brief description with contact details

Upgraded listings are the same but also display an image or logo, are colour coded and also provide links through to the business websites

An example of an upgraded listing can be found here –
https://www.uksmallbusinessdirectory.co.uk/listing/210792/

IT Contractors UK