"A mood board is a type of visual presentation or 'collage' consisting of images, text, and samples of objects in a composition.
It can be based on a set topic or can be any material chosen at random.
A mood board can be used to convey a general idea or feeling about a particular topic.
They may be physical or digital, and can be effective presentation tools"
So in a scrapbooking sense you use the colours and images in the Mood Board to provide you with the inspiration to kickstart the creative process.
For instance you could focus on the blossoms in one of the images from the Mood Board below, by creating a Spring or garden themed card or scrapbook layout.
Or you could focus on the party image and create a scrapbooking layout featuring a party or baby shower. These particular images are very much Valentine-type images so of course, you could focus on a Valentine-themed project.
Another option is to focus on the colours in the images which then makes the possibilities endless.
It's really very much open to your own interpretation.