there is spray paint for plastic. same shelf as the spray paint for metal and everything else.
I used it a lot when I was red hatting, we painted a gazillion plastic things. Go for it.
I have gorgeous rhinestones on my 6600 Janome machine and on my mocha singer 401 I found some lovely tea colored rhinestones. Card making isle is where I found them.
I've never understood why machines computers office equipment has to be black or putty or what....with a million colors in the rainbow and obviously plastic can be made in any color.