There is no utilities to make charmap (the way pixels are arranged to generate a character) creation easier. An idea would be to create a python script that reads a PNG file of 256x256 pixels (32 characters wide and 32 long, each with 8x8 pixels) of only black and white pixels and generates a charmap.mif with the characters. This would enable the creation of new characters just by using an image editor and changing the PNG file.