I’ve been working on a large update for MAX7219 LED Matrix Shape Maker that will make it much better than before. It includes remembering your settings, an advanced and 100% configurable code generation system, multiple LED matrix shapes and set saving.
Update: Now you can change the colors of both the cheap and fancy rendering modes as well as the background color. I’ve seen some other LED matrices that have blue for instance. So this is pretty neat. It supports both hex format (#89ABCDEF) and ARGB format (100,100,0,200).