Or you could go straight to the source
. Here is the link to a pair of socks made with Lopi. The pattern is for more than 1 color, but you could do it all in 1 shade if you wanted to:
The other thing would be to go to www.knittingpatterncentral.com
and look in their slipper section. Also at www.lionbrand.com
, go to their free patterns for socks and slippers.