Graph paper galore

Free Online Graph Paper (http://www.incompetech.com/beta/plainGraphPaper/) offers graph paper, lined paper, ledger paper, music notation staves and chord diagrams, calligraphy guideline paper, even Chinese Character Guide Paper, and much more. All these templates are free and can be downloaded in PDF versions. Interestingly, the paper can be customised using an online module: you can, for instance, set the paper size (A4, A3, etc.), the margins, the colour of the printed lines, the number and weight of the gridlines, etc. Then click on the Get PDF button, and the sheets are printed!
As the site itself admits: ugly website, brilliant content.