Back in the day, I used to create graph paper on a dot matrix printer...Had a need for graph paper and decided to create a page to generate it for me. This graph paper page allows for adjustable cell size and cell count.
My son was interested in game development (not computer game--just game) and I created this hex-graph-paper page to help him create maps for his war games.
One of my son's assignments involved charting a list of coordinates to view a picture. The idea intrigued me and I created this interactive coordinates charter to help him with his homework. It could also be used to create new assignments too--draw a picture, then give someone the list of coordinates. It's up to them to then recreate the picture using just the coordinates.