I have been collecting scraps of fabric - these are made from a shirt from Oxfam, some felt from my workshops bag and a top I don't wear:
I thought the plain books were a little understated for me, so I ferreted around and found some funky paper for the endpapers. The swirly one is just regular gift-wrap which, to be honest, was a bit thin so I won't do that again, but the stripy stuff is cut from a wine gift-bag, nice and thick - ideal.
I didn't get them sewn up yet - you should let the glue dry overnight (ideally under several heavy books) before drilling the holes, but the bulk of the work is done. You can see how the sewing will look from the previous one I made: