Geysers and fountains!
Geysers and fountain's can be powered by pulser pumps.
I have only made one geyser and people found it very interesting. The geyser would explode into life every few minutes and it could be adjusted to produce a fountainy blast of water or a fine mist and more or less everything in between. For a geyser or a fountain, you need a clean water source and a pool at least 4 ft deep. The supply of compressed air can be a pulser pump or perhaps a windmill working a small air compressor.
Check the drawings for more details (they are not fully complete but might help you)
 
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