I do a couple of wire sculptures that you may be interested in. Bothe are made with aluminum wire, around 14 to 18 gauge.
The first is wire trees, which is fairly simple in concept, but has the attraction of being challenging to advanced students, but not too difficult for beginners.
The object is to sculpt a tree by first making a trunk from two pieces of sturdy wire, lashed together with a finer wire. From there, bring more flexible wire up the trunk by twisting it diagonaly to form secondary branches. Continue to use finer wires as the sculpture progresses, and it will actually look like a real tree. Mounting the completed tree on a rock adds a nice finishing touch. I used to kick this up a notch by adding "leaves" of melted crayons dripped onto the ends of the branches.
Another project is a wire human or animal form, made with a basic wire armature that is wrapped in finer wire to give it mass. Start with a 20" length of wire, looped in half. Twist a head and body in the wire, then add another 8" length for arms. By bending the wire and shortening the arms, you can make an animal shape. Add a tail, and youv'e got it! Use finer wire to wrap the limbs and head and give it dimension. This is a simple, useful armature for paper mache or plaster sculpture. Clay has a tendency to crack unless you use plasticine. Hope this helps.