NB if you colour them flat then remember that the side of the wings that you see when it's put together is actually the back of the plate.
They look very cute on top of Christmas trees or lined up on the mantle piece, and you can make them tall or short with long or short wings by adjusting how close together you make the two half diameter slits. Close together makes a tall angel with a skinny robe and long wings.
If you want to do non religious then a variation on the theme will give you a fairy, although the cutting is a little more involved.
At some point I'd like to draw out five or six different angels/fairies on a page of paper and scan them in, so you can print out a page, colour and make finger puppet sized ones. Maybe in the new year.