A purely decorative oil drill.
It doesn't really drill for oil and is relatively easy to build. It looks like it is drilling or pumping because the piston goes up and down.
Instructions:You have to build a Redstone Clock and connect it to the piston, whereupon the piston goes up and down (sticky).
Place a block of glass on the piston. You should place the piston (as in the picture) so that it points downwards. It is best to build steps on the edge of the hole and in the hole a redstone block. The redstone block should represent the oil (you could also take black wool or obsidian).