Project icons generation

I have a group of projects that, due to external requirements, share the same first letter and the last word start with e or m. So all my project icons are either OM or OE. I get this look in the toolbox. For reference:

• “GP es” I made that one with two rows
• “OM” green, “OE” purple, “OM” brown, “OE” lighter green, normally generated by JB
• “PE” generated by JB with me changing the display name in .idea/.name file

 This is barely ok because I have to create icons for every project. I was wondering if I can alter the generation process somehow, either changing the algorithm or configuring it. I would like to be able to configure:

• The rules that select the letters
• 2 lines instead of 1
• Background color(s) to visually differentiate among groups

Besides, my icon is displayed smaller in IntelliJ windows and the other icon changes color every time the project is open, so I can't rely on color to locate a project:

Is there a way to do this?