I'm not much good with identifying the various tram classes, so where I could I tried to get either the four digit number off the side of the tram, or the number off the trams front windscreen.
Today near the corner of Latrobe and Swanston Street I saw:
-(is it D1?) 3524 with Tontine Doona all over livery (black with pink writing)
- 164 on the front windscreen advertising Collins two-three-four
- 14 on front windscreen advertising "Stonnington Style" with red all over livery.
- 116 on front windscreen with "The Age - selling the best properties" with a green/cyan all over livery
Feel free to correct my complete lack of tram knowledge!