Bookend
This is super easy and fun
Step 1: the Bookend
get the wedge shape and get a box shape the box must be a hole and then adjust it then group it at end it must look like this (look at above picture)
Step 2: the Design
This is the cool part. You can do whatever design you want but if you want it turn out like the one at the very top do this. Get the Astro-bot shape and put it into the Bookend then you can put anything you want