Here is my creation on templates which can help you on your note-making, mind mapping, design etc:
Online Graph Grid Paper PDF Generator (beta)
I have hacked this myself for my own use a while ago, but I think at the moment it is pretty useful to release it. By default it should suit for many people, but if you want to customize, there are couple of good options. For example, there are Page Size (Letter, Legal, A4, A3, A5); Line Thickness; Minimum Border; Color of the grid line and; Grid Spacing.
I hope you will find it handy. I will add more and more of my tool and template collection into that page. Stay tuned!