How can the theme be customized to exude 68k-ness? 
Here are a couple suggestions. Feel free to add more!
*Make form widgets resemble System 7 - simple black and white, with rounded corners on buttons.
*Make form buttons (button, reset, submit) and labels use Chicago, Charcoal, Virtue fonts.
*Use other "period" fonts (and look-alikes for fallback) where generics are used (e.g. New York for serif fonts).
*Use the Mac face background. (Not sure of the legality but it would be cool.)
Here are a couple suggestions. Feel free to add more!*Make form widgets resemble System 7 - simple black and white, with rounded corners on buttons.
*Make form buttons (button, reset, submit) and labels use Chicago, Charcoal, Virtue fonts.
*Use other "period" fonts (and look-alikes for fallback) where generics are used (e.g. New York for serif fonts).
*Use the Mac face background. (Not sure of the legality but it would be cool.)