I made a sock blanket like Mrs Flibble's (at the moment, to be fair, it's not a blanket as much as a piece of material).
Just cut the tops off the socks (then reuse as hairties...). Then cut straight across at the heel to made a tube. Then cut the heel off completely (just the heel bit) and then the toe so you have another tube.
Then cut down the sides of the tubes to make big squares/rectangles, or cut down both sides to make rectangles.
Pile the rectangles on top of each other to see if they're roughly the same shape. Cut any that have wild bits sticking out.
Sew the rectangles/squares together right side to right side. Make a strip to start off with and then sew the strips to each other right side to right side.
Done!
Here's mine:
http://www.craftster.org/forum/index.ph ... z2MTC1roE3
It's currently over the arm of the chair next to my computer to protect the leatherette from being damaged when I put my feet on it
@Daveswife: Socks that are purchased in shops are usually fine to do this with as long as you're sewing them together in good time. Handmade socks will unravel straight away. Old socks that have been washed and worn will hold their weave. Old handmade socks that have felted should be ok too.