Beautiful Mathematical Images
I produced the following images, which I personally like ;-)
A part of the Mandelbrot set:
A projective curve in $\mathbb{P}^2$:
$\mathbb{P}^2$" />
Penrose tiling, an example:
http://en.wikipedia.org/wiki/Penrose_tiling
Or any basic first year theorems (or more advanced) theorems like MVT, Taylor, BW, cardinalities, ordinals etc, in nice fonts or even as sculpture.
Complex but symmetric 3D objects like the Wolframram Alpha star for example, see also George Hart.
How about the Buddhabrot?
You can say something to the effect of "Find your path through Mathematics." :)