Vitextra Smart Tiles allows building custom tiles navigation panel. Each tile has Color option to manage color of the tile.
This article describes available colors of tiles.
You can choose one of six accent colors defined by the site theme where the web part is located.
Some SharePoint Sites do not provide a list of accent colors. In this case, the current theme accent color will be used.
Also you can use predefined color for each tile.
Predefined colors of Smart Tiles based on Shared colors of official Microsoft Fluent UI.