OK, how 'bout going retro? I've thought about adding a pair of those bubble-tubes that you see on old juke boxes. Would be a cool addition to a watercooled rig.
Else one of those slow motion wave machines (like you see at the mall) in place of a standard clear window. Googled it but could not find what I was looking for. You know, one of those clear boxes that slowly tips back and forth and looks like big waves.
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