Family Fun has an fun idea for your snowman party -- Snowman chair covers. They have a tutorial with a little sewing involved, but I think it would be a little easier to use a white pillow case and then glue some felt pieces and buttons or pom poms on.
We cut the log (landscape timber? )into 3 parts, used socks from the dollar store for the hats, cut the nose chips out of wood and material of choice for scarves. Buttons hot glued down the front and paint for eyes and cheeks.