A easy script which converts a char-array to a pixel art on shell(ANSI color code).

pixel_converter.py

#!/usr/bin/python
# coding: utf-8

import sys

argvs = sys.argv

f = open(argvs[1])
line = f.readline()

dict = {"A":"^[[30;7m　",
        "B":"^[[31;7m　",
        "C":"^[[32;7m　",
        "D":"^[[33;7m　",
        "E":"^[[34;7m　",
        "F":"^[[35;7m　",
        "G":"^[[36;7m　",
        "H":"^[[37;7m　",
        "\n":"^[[0m"}

while line:
        chars = list(line)
        line = f.readline()
        print "".join(map(lambda x: dict[x], chars))

The character ^[ might not be expressed correctly.
So, generate it in this way
$ echo "\033[30;7m " > hoge