I made a diorama for Calico Craft Parts 3 or 4 weeks ago. I am now sharing it over here. It's pretty much 100% craft parts apart from the box which came free with 4 pairs of socks inside at Christmas.
I used some decorative flourishes for waves and simply started to layer the different parts on to each other to build up a 3D scene.
Flourishes (for waves)
desert Island (Palm trees)