Even if you make only simple bindings it is always worth spending some time on cover design. Check these two TED lectures by an American graphic designer Chip Kidd.
Stepan is the owner and editor of iBookBinding.com since August 2015. He has been a bookbinder since 2006 and has taught hundreds of students since 2014. Recently Stepan spends more time crafting and 3d-printing bookbinding tools than making books.