http://i.imgur.com/1hrQ6xi.jpg
https://i.imgur.com/AFhQ7SW.jpg
https://inhabitat.com/rainbow-hued-ole-kirk-lego-lamps-cast-...
http://www.legopunk.com/?q=node/42
Here's another guy that put a creative spin on LEGO painting: http://www.thisiscolossal.com/2015/02/lego-piet-mondrian/
The Pi calculator is particularly brilliant: "Naturally, a more accurate value can be obtained by using a bigger program."