In the Webme editor you have the option to change the background color of each section in accordance with the colour scheme of the website. You can choose between two colour options, a lighter and a darker one. You find this option when going to the Settings part of the menu and scrolling to the Background Color part.
Note: This is the only option to change colours of a website at the moment. There is no way of changing a section to another colour or changing the colours of the whole colour scheme.