Here are some T-shirts, a couple based on autologlyphs and some other mathematical designs. I'm using Spreadshirt.com, which lets you upload designs to their website, they deal with all the printing, shipping etc., and I get a small commission on each sale. The prices depend in part on how many colours are used in the printing.
The designs are a bit difficult to see on their site, so there are larger versions of the designs with a few details lower down on this page. You can also put these designs on other kinds of clothing, tote bags etc., as well as choose your own colours and so on here.
Create your own shirts/tank tops/bags etc. with these designs.
(March 2009) Updated version of the image I use to link to my page on Autological words.
(Jan 2009) This is the smallest solution to the problem of taking a square and dissecting it into a number of smaller squares, such that all of the smaller squares are of different sizes, in the sense that it requires the fewest number of smaller squares, 21. It was discovered by A. J. W. Duijvestijn in 1978.
In the create-your-own shop is also the negative version, where the borders between squares are printed and the squares are not.
(July 2008) Third iteration of the Peano-Gosper space filling curve, with some extra added edges in the lower right to close off the path. From a Mathematica notebook with some editing in Illustrator.
(June 2008) The figure 8 knot, rendered in Rhino then traced in Illustrator.
(June 2008) Five tetrahedra arranged within a dodecahedron, also one of the stellations of the icosohedron. Designed in Rhino then imported into Illustrator.
In the create-your-own shop is a version with one of the five tetrahedra in a separate colour from the other four.
(June 2008) Based on a spiral I've used elsewhere, generated and Voronoi diagramed in Mathematica. Colouring of nodes is based on the mod 2 and mod 3 values of the number of the node.
(June 2008) Another colouring scheme, this time using a "metric" on the natural numbers, based on how many Fibonacci numbers you need to add together to sum to the number. Here the white nodes are the Fibonacci numbers themselves, light blue is 2 Fibonacci numbers, dark blue 3 and red 4 or more.
(June 2008) A vector version of an autologlyph from 2002. Designed in Illustrator.
(June 2008) Another updated autologlyph. This version is a little cleaner in that it only goes up to pentominoes, and the polyominoes are at only 45 degree angles.
Other T-shirt Designs
(January 2010) A design for the Texas Juggling Society's Jugglefest. I did the tessellation design (and the back of the T-shirt, the second image here) and then Rick Rubenstein (who did a degree in drawing before he became a professional juggler, but now works at Apple) took the tessellation and worked it into the front of the shirt (the first image here), based on Escher's Reptiles print. There was much discussion of the appropriately juggley replacements of the objects in the print.
My brother Will happened to have the right combination of waistcoat, bellbottoms and hair that can be fashioned into ears, in order to serve as a model for the cat.
The juggler is a cat because the need to define the shoulder led to ears, and the bellbottoms are needed to deal with other surrounding shapes of clubs. The waistcoat/suit jacket just seemed to fit.
(October 2009) Another University of Texas at Austin Math Club T-shirt. Based on a design by Neil Hoffman.
(October 2009) A repurposing of the figure 8 knot design for the Stanford University Math Department's T-shirt, in two different styles.
(March 2009) Design for the University of Texas at Austin Math Club's T-shirt. Texas fits together with itself remarkably well.