Many books at http://librivox.org have generic cover art. The cover art URL is in the rss
file and can be changed in a simple way.
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in Mobile Safari goto http://librivox.org/second-variety-by-philip-k-dick/
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press "RSS Feed" then tap Copy ( the url
http://librivox.org/rss/4248
is copied to clipboard, the.rss
will be added for you later )