Above: One demonstrator showed how to make diorama cards of various sizes.
Using craft stampin' spots rubbed on opened brag book page protector with glossy card stock sandwiched between, one demo dubbed this technique the "Craft Smoosh."
This technique uses scraps of paper stuck to sticker paper, with embossing powder (irridescent ice here) poured in the gaps and heated.
The circle in the card front was made using the round tab punch vertically, then horizontally. It works! You should try it at home if you haven't already.