I used Joann's regular cotton diaper fabric cut into 3x6 inch pieces folded over to 3x3. As you can see (hopefully--just click on it to make it bigger) from the photo below, they are sewn around the edges leaving a small opening to turn right side out. Don't forget to clip the corners before turning. I then top stitched close to the edge around the entire outer edge.
Don't they look nice in there?
The only problem I had was figuring out what to do with the used ones in need of washing. I didn't want to have to run to the hamper every time I used one, and they're so small I was afraid they'd be lost in the laundry. My solution was to make a small voile bag to attach to the containers for the used pads. The voile is airy enough to allow the pads to dry out preventing mildew. If you don't want to make the voile bags, check the wedding section of craft stores. They usually have small bags like this.
Here are the two in use at my house:
I love the size of the pads, the cloth washes really well, it's good for the environment, and cheaper than continually buying pads. Give it a try!