For a current interior project we are using J Moldings to finish off the bottom edge of teh wall. approximately every 1' we are also installing an aluminum screed channel, giving a nice effect to the wall. There is also a wide variety of channels, inclucding v-grooved channels, curves and other hardware for finishing off all of the assorted angles and cuts necessary for installation.
It always seems that one of teh age old problems with scenery in any form is how to deal with seams. These channel options allow the edges to be designed in to the overall look.