If you want something like a hex map, try this link:
http://incompetech.com/graphpaper/trianglehex.html
The resulting overlay is in the form of a downloadable PDF file, and is absolutely free.
If what you are looking for are map overlays for dungeon levels and such, they have other graph paper PDFs that would be more useful for that.
You could also use your Game Links to point at drawings of your maps you have scanned as .jpeg or .png files (hosted on Dropbox or some other file hosting service) or as .PDF files if you wanted to use Google Drive.