in gearing up for our lenten labyrinth retreat in a few weeks, a colleague came across the online labyrinth at Gratefulness, a Catholic network. the site features an introduction to labyrinths and then links to eight online labyrinths at MyMaze.
The MyMaze site has extensive information about labyrinths - photos, "how tos", etc. It shows you two easy ways to draw a labyrinth.
The Gratefulness stie also have a page on Practices for Grateful Living.
Of course, you can also go to http://www.labyrinth.org.uk/, courtesy of steve collins.