A small python file to display all curses-supported colors on your terminal.

colors.py

import curses

def main(stdscr):
    curses.start_color()
    curses.use_default_colors()

    for i in range(0, curses.COLORS):
        curses.init_pair(i+1, i, -1)

    colorno = 0

    fmt = '{0:3}: color'
    fmtlen = len(fmt.format(0)) + 1

    while colorno < 256:
        line = 0
        for i in range(0, int(curses.COLS / fmtlen)):
            for j in range(0, curses.LINES):
                stdscr.addstr(j, i * fmtlen, fmt.format(str(colorno-1)), curses.color_pair(colorno))
                colorno += 1
        stdscr.getkey()

curses.wrapper(main)