There is also a technique called a "knife edge" finish that is often used on art quilts and can be found on many antique quilts. Here is a tute I found on the technique but there are other ways to do it besides what is presented here:
http://welshquilts.blogspot.com/2011...nife-edge.html
Here is a good link that explains many different finishing techniques.
http://piraterodgers.com/tutorials/a...nishes/AF1.pdf
Edited to add, if you do choose the knife edge be very cautious if attempting it using the pillowcase or birthing method as it is very easy to get pleats, gathers or puckers in your quilting. Here is an example of a piece I did using the birthing method and I did get pleats and some fullness in areas when quilting (which are quite obvious in the close up picture). As it is a small piece and utilitarian I didn't care but it is most definitely not suitable for show and would detract from a nice art piece.
http://www.quiltingboard.com/picture...s-t280296.html