Have you done any layouts that looked floating and full of dimensions? Why not try this? I've recently done a layout titled "So Sweet!" which gives the look as if some parts of it are actually floating.
In the layout, I've used some foam tapes to create the dimensions and the floating effect to it. I've used different thickness of foam tapes to create the different floating heights on the layout which gives it more depth in dimensions. You can also mix different shapes of floating pieces in a same layout.
With this technique, I could say that besides embellishments, there are some other more simple and fun way to create dimensions in a layout. Try it!