J.W.
I read the title and thought of chairs getting over an addiction. :p
I always just picked a fabric to match the window treatments, I am strange that way. They are really easy to cover. I have always just gone over the existing cushion. Just cut the cloth larger than you need because you snip the extra. Take a staple gun, when I say staple gun I don't mean office depot, I mean Lowes. Half inch staples. Anyway, staple one side underneath, then the opposite, then the sides. Keep adding staples ever two inches till you get two inches from the corners. Then you do some decorative tucking, kind of like wrapping a present, then staple that in place. Then reattach the cushion to the chair.