The name of this project brought many memories of the HP 48G to the forefront of my mind, after so many years. Its 1 bpp pixelated icons and drawings were indeed called GROBs - there are collections of these online. What a coincidental but fine name for a pixel-capable graphics editor.
Haha glad it brought back fond memories! Grob is just the nickname of my username GroverBurger. Fun coincidence.