And if that weren't enough, there's also [http://www.erentales.com Eren Tales] - a collaboration between Clark and photographer Brandon Rechten, which gives you twelve more short stories and twelve works of art as a companion to this wonderful, worrying, inspiring little book.
I think you might also enjoy [[The Savage by David Almond and Dave McKean]], [[Not Yet Dark by Simon P Clark]] and [[A Monster Calls by Patrick Ness]].