In many cases, you might want to customize the look and feel (Layout and css) of the BeYourMarket application. And you might even want to make a Theme that can be reusable.
You could achieve this with BeYourMarket Theme.
There is a folder called Themes under BeYourMarket.Web, and there is a folder Default which is the default theme that BeYourMarket is used. You could customize the less in order to change the color.
To add a new Theme, you could create a new folder with the theme name and define the same structure as Default.