Tatsuo Horiuchi didn't always use Microsoft Excel to make his artwork. He first gave Microsoft's Word and Paint programs a try, but oddly enough, he found Excel's spreadsheets to be the most flexible. The 73-year-old artist first used the software a decade ago after observing co-workers using the program to draw graphs, and stuck with it partially because of the high cost of programs meant for graphics. 

Curious about your own Excel aesthetics? Download one of his works and give it a shot here.