Choose a picture you want your class or group to recreate, make sure the picture difficulty is appropriate for your age group. The example here is Stary Night which would be suitable for older children.
Open an excel doc
Make resize the cells so they are the ratio of a piece of paper
Go to Insert → Shapes
Pick a rectangle
left click and click on format shape or picture
On the fill page click picture or texture fill
If you already have your file click on file and input the photo
Go down to transparent and slide it to 50%
Highlight the cells behind the photo, go to the home page and put a border on all cells
Create your grid putting the letters vertical and the number horizontally
Print it off, you are now ready for the kids to make a masterpiece
Print a photo you want to enlarge onto graph paper
Give one square to each child, have then really look at the square. Look at the colors used and the size of each brush stroke or line.
Give them a large square piece of paper. Make sure they mark what their grid square is (example: D3)
They will then use scaling to enlarge the square onto a larger piece of paper.
When all squares have been completed assemble the picture. Notice that some people paid close attention to details while others concentrated on the big picture. What else do you notice about the colossal picture?