As of 2013, the closest I can find is Blacken.
Blacken is not a curses library per-se. It moves away from the terminal, and instead, renders it's own "console window." This has the disadvantage of not looking "console-like." Instead, you get full (arbitrary) colour support, and a curses-like API (in addition to their main API).
You can also set the font to Mono
for fixed-width characters.