I have taken over both of my kids' former bedrooms when they grew up and moved out. My son's room is my "sewing room" where my machines, stash, tools, etc. are housed.
My daughter's former room is my "quilting room" where I keep my frame for hand quilting.
Both rooms are about 11.5'X 11.5', so neither are very big rooms.
Here are links to pictures of the rooms.
Sewing room:
http://home-and-garden.webshots.com/...54504466IvpdMW
Quilting room:
http://community.webshots.com/album/554503917daaHXl