When I was decorating the playroom in our new house, I wanted some bright, colorful art for the wall, but I didn't want to spend a lot of money. So I bought some cheap frames from IKEA, painted each a different color, and then went looking for something to put in them.
I decided to take some of my daughter's (and my) favorite books and use them. I made color copies of the pictures I chose because I had to adjust the sizing for my frames, but you could just cut out a page from an old book or hit up a thrift store to see what they have. Another easy idea would be to frame a book jacket.
Mine turned out beautifully and I love how they look in our cheerful playroom. I chose pictures with no text on the page (or used my photocopying to cut out the text) but I think it would be lovely to choose a page with your favorite lines on it as well.
This is a very versatile decorating technique, as you could adapt it to a baby's nursery, an older kid's room, or even an adult room or a living space.