Notes on using Tesselations.xls
There are no macros in this file.
I simply found that using the drawing tools in Excel was a convenient way to set up tesselations.
Once you have drawn a shape, select all the parts, right click and group them so that the shape can be manipulated as a whole.
Select a shape and drag to translate, use the green dot to rotate it.
Use Ctrl+D to duplicate a shape.