Buy a paperback sketchbook. Make your own or use loose leaf paper.
Stick magazine images onto the sketchbook's pages.
I've been hoarding a draw full, it was time to get rid.
Easy method of concealing the 'blank page'.
Once you've worked your way through 4 sticks of glue, it's time to trim the pages.
I'm not very neat about it.
The results are random if you don't get to precise when sticking stuff down. I've chopped a few heads off.
Next: Layering the pages with lots and lots of mess.