First you'll need to find some quotes that you like. (If I hear/read a quote I like I always write it down somewhere) It can be from lyrics, a famous quote or anything you like.
Now you'll have to find the fonts you want to use. It can be a good idea to download some free ones from a website (just google free fonts and you should be okay).
When you've found your quotes and fonts, all you need is to arrange it nicely in a word document and then print it in a size that matches your frames.
Now you just need to put the paper in the frame and you're done!
(Or well you still need to get them up and hanging..)