This abstract Keynote Theme is all about dance! But not ballet slippers and Dance moms type of Dance, but a dance invented on the streets for the streets. Krump. This theme will really keep you audiences attention while helping you to get your point across. Using people in the background of your presentation has become a recent style choice many are taking. With this the background is incredibly dark so using a white or light text will really stand out.
I found this picture on eWallpapers. You can find a bunch of images to use as Keynote themes there.
Just simply add a new slide and add an image fill background to extend the picture to your new slides.