Check out the process page http://www.artlebedev.com/everything/isiklarius/process/ http://www.artlebedev.com/everything/isiklarius/process/ I really like the

Check out the process page http://www.artlebedev.com/everything/isiklarius/process/ http://www.artlebedev.com/everything/isiklarius/process/ I really like the ones by Ji-youn with a triangle for stop, circle for orange and rectangle for green. You can see some serious effort went into this