For fun, I have designed a font like that once. Each hex digit was 4x4 grid, and there were (visually distinct and symmetric if possible) patterns of 0-15 fille

For fun, I have designed a font like that once. Each hex digit was 4x4 grid, and there were (visually distinct and symmetric if possible) patterns of 0-15 filled dots. I also thought about an extension for having a symbol for each byte value in 16x16 grid. The lower half byte would determine a 4x4 pattern, which would be repeated over the 16x16 grid according to the pattern corresponding to the higher half byte.