Looks like MS have integrated the previous ‘labs only’ feature into (Windows Live) Photo Gallery.
Makes a very presentable collage of different photos with minimal fuss:
(Collage built for ‘Live Tile Sport’ Windows 8 App)
“Trying to create a collage of photos on your own is hard and usually requires expensive and complex software. With Auto Collage in Photo Gallery you just select seven or more photos and we’ll arrange them in a collage for you. Making a new photo our of existing photos has never been easier. Whether you want to make a special print of a collection of photos or you want a nice start or ending to a movie highlight with some of your favorite scenes.”
Give it a try: http://g.live.com/1rewlive5-all/en/wlsetup-all.exe