I have the blue Roof of Heaven cover for the Nook
It's really incredibly well made and, tbh, the best thing about the Nook I bought! It's quite heavy though and I'm not really sure if it would protect from a high fall. Folding back the cover is no problem and it softens fairly quickly. Highly recommended - I would have ordered one for the new K3 I have on preorder but I wanted the cover with an embedded light.