You mean like this:
cmotion.pdf (42.7 KB)
Just create the icon you want in your favorite graphics program, then paste it over the old icon in getinfo.
(But you’re right, we need an official fix.)
For the lazy who don’t care if they are quick, dirty, and ugly (my wife says get off the computer) -
Select application in finder, CMD-I (Get Info), click lock (if locked), enter password, copy image from here, select icon in upper right hand corner of Get Info, paste new icon, close Get Info - You’re done. (Please feel free to improve, I spent less than 5 minutes on this, and it is pretty gruesome. Now, I really have to go - Bye!)