The pattern of the book cover I made for my art-journal is written and uploaded to my blog. It is also available in dutch. It is an easy pattern. The yarn I used is Katia Jaipur, a very thin yarn, with many color changes. You need not much yarn, just a skein or for a very small book half a skein.
The pattern is to be found here >> book-cover-pattern
The dutch pattern is available on >> Elzeboom