Here’s a pretty good PDF on making your own mini-hydropower plant using (mostly) things you already have around the house – Link.
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Cool mod! Clear bricks might add even more visual interest. For instance:
2 x 4 trans-clear brick:
http://www.bricklink.com/search.asp?q=trans%2Dclear+brick+2+x+4
2 x 2 trans-clear plate:
http://www.bricklink.com/search.asp?q=trans%2Dclear+plate+2+x+2
how do u hollow out the lego
they should make these commercially