I've never thought about that before, to be honest, mainly for two reasons.
1) I don't like leather.
2) I'm forever changing something about my books, and I want to stop, but the perfectionist side of me keeps going in the lead.
But it's a neat idea. 
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Quote:
"A memory is something that has to be consciously recalled, right? But it's different from a memory locked deep within your heart. Words aren't the only way to tell someone how you feel...As long as I'm with you, as long as you're by my side, I won't give up even if I'm scared." Tifa Lockheart, Final Fantasy VII