There are an infinite variety of possible fullerene and fullerene-related
molecules including very large spherical cages, long thin tubes, and
doughnuts, to mention a few. If you have a Java-capable
browser you can examine a few of these molecules.
A capsule or tubule of 180 atoms.
Hypergraphite - a fullerene-related solid.
C2268 - a large tetrahedral fullerene.