What makes a beautiful minim head? I've attempted a mathematical approach to the design and I think I've come up with something quite elegant, though there could be more improvements to be made.

Here's an example of it (alongside a correspondingly designed crotchet notehead) in use.

Why the lines are different widths I'm not sure; the anti-aliasing in Adobe Acrobat seems to be quite poor.
For comparison, here are eight minim heads in different fonts.

Take this comparison render with a grain of salt. Whilst attempting to put this together, I noticed that the attractiveness of the noteheads varied according to the size of the music. I think this is worth researching in to as perhaps a "best" font would have varying designs according to resolution. Also, this comparison is a composite of screenshots taken from Finale's internal rendering. As such, the glyphs appear to be quite roughly rasterised. I'll post a vectored version if I can figure out a way to get the glyphs to display at the correct sizes.
~Fluffeh
EDIT: Removed night-time grumpiness.