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School Filters
I'll actually help you out, because this (seems, at least) to be a truely worthy cause. (So long as you're not using the image search for the biggest industry on the internet.)
Take a look at Proxies, and CGI Proxies. Failing that, there's always Tor, or Torpack if you have a USB Drive.
if I remember well you can also try with IE to make it so the packets sent hold a smaller amount of data, therefore you will send many many more packets and the filter wont be able to read them all, dont know if it actually works but I rode about it some years ago, they used to do it in China to avoid the gov filters detection (among other things). or u just find a good proxy near you that works and u configure IE :D.