You'd think that with John H. Conway around, this should be like shooting fish in a barrel. One title that comes to mind is
- The Sensual (Quadratic) Form
and there are more goodies if you look at his bibliography. For example,
- Character Calisthenics
or
- The $\sqrt{\text{Monster}}$ Construction
I also like the paper (both the title and the contents!) by Andreas Blass,
