What might be an idea to add a bit more "random element" to it, is actually parse the page you download and find out which links and images go to other remote sites. Download those images over 10/20 minutes or so, and then go to the links. This was at least the site you are downloading from may get a bit of money from any ads on the site: keeping it up and running... Just a "webmaster friendly" style thought...
Download from somewhere like Yahoo
or (quick plug)Beebware Directory
(end plug) and then recursively parse it,and you'll have loads of 'random sites' to visit for hours on end: how will your ISP tell it's a bot and not you? You aren't visiting the same pages over and over again (which could be in their cache anyway)...
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