I do a lot of "handwritten" stuff for fic and stuff. If you look through DaFont, they have a wide selection of handwritten fonts, and then you can find some blank paper images through Google image search (or use paper brushes to make one in GIMP or PS.)
An example of what you can do with custom fonts, GIMP, and paper brushes. :D (I've got 14 examples in that fic.)