I wanted to have a go at these last year but time ran away with me! It's such a traditional craft that puts me in mind of the autumn harvest festivals at church when I was little. But I think salt dough lends itself to all sorts of things. (Loads more info here) It's kind of like a store cupboard Fimo!
You can mix up any amount of dough you like as long as you stick to this ratio. 2 parts flour to 1 part each of salt and water.