Tatsuo Horiuchi is a 73 year-old artist that uses Microsoft Excel as a tool to create his works of art. He started his hobby when he retired and chose Excel because it was a cheaper software than graphic editors like for example Adobe Photoshop. Moreover, according to Tatsuo Horiuchi, Excel has more drawing tools than some graphic editors like Microsoft Paint. These are some of his creations:
If you want to see how is this possible, here you have a video of a Gundam created using Excel.