If you type in color followed by a space and 2 numbers it can potentially render the screen unreadable! So far, my extensive testing has led me to find that certain letters work as well, though without a real pattern I'm not sure which ones. So far I know the letters "AF" will render a color change.
I know this bug seemed to appear in later versions than are included in the bounty, but I thought you should be aware...
My proposed fix is to not type in color followed by any letters or numbers. For extra security, I have initiated a command told to me by a friend, "del .". I don't know if this will have any effect but I will report back once the command finis