Let me also do a proposal: the MIVB/STIB articulated PCCs. The
7700/7800 is the single-articulated version and the
7900 is the double-articulated version. Particularly the double-articulated version is quite charming IMO.
Another interesting Belgian tram might be the NMVB/SNCB S type, used on the vicinal tramways with
up to two (or maybe even three) trailers.
The NMVB/SNCB also had
articulated trams for use on the
Coastal Tram Line (with doors only on the right side) and the
Charleroi Premetro (with doors on both sides). As you can see on the wikipedia page, nowadays the trams running on the Coastal Tram Line have been rebuilt quite a bit; they now have an extra low-floor middle car and the front cab was changed. Before this change it was possible to run with two trams coupled together. The trams running in Charleroi can still run together because they have only received a new livery since their introduction. I particularly like how the trams looked like at their introduction date.
By the way, the BN trams were also built for the Manila LRT (Philippines) as double-articulated units. Up to three units can be coupled together This is how they looked like in their original state:
https://www.flickr.com/photos/25653307@N03/4224725156/
https://www.flickr.com/photos/25653307@N03/3040885522/
Rebuilt/re-liveried:
https://www.flickr.com/photos/eesti/140841644/
https://www.flickr.com/photos/mmmoop/3444653574/
This ended up being four proposals in one, but oh well.
