From yesterday I don't have to search for inspiration ever again. Now I now where to find it:) In this book, One Thousand Polish Book Covers (read about it on Fine Little Day) you´ll find 1000 great samples of typography, pen drawings and composition. The book is exciting, fun and crammed, and thick as a brick.
More nice covers: M-Edge, style Library
Vignettes of Ystov (via Book By Its Covers). Don't miss the sketches by William Goldsmith!