Anna Sturgeon and Paul VanWagner made this toroidal checker-board (complete with pieces!) as part of Mathematical Perspectives: Visual Math (May 2004).
There are eight triangles surrounding each vertex in this bit of hyperbolic space that Jeffrey Solomon made... this was done in conjunction with Mathematical Perspectives: Dimensionality (April 2004)
Tetrahedral frame with Jon Fretheim and Aaron Howard, November 1999
(this eventually became Five Intersecting Tetrahedra)
Bob Vrba made a foil buckyball and a Butterfly Ball, April 2000
iso-area zig-zag thingy (modified hyperbolic paraboloid) with Aaron
Howard and Jon Fretheim, September 1999