This Max for Live device lets you set up a big (or small) monitor pop up window for your metronome.
You can customise colours, slides, circles and flashing in beats.
One Limitation: If you use time signature changes in the Arrangement View the bar count numbers/’flash on count 1′ won’t match. This is due to a bug in Ableton Live which I can’t do anything about.
Please watch the tutorial here: