Not shown: two double panels of The Rolling Stones on stage, a BIG gigantography covering all the roof (from the inside) of Maradona, and a lot of small curtains and trinkets of Boca Juniors in the front.

Best one I can remeber? The dude with a fake "minibar" of alcoholic beverages next to the drivers seat, and a LOT of fluffy interiors, like you know teddy bears with long "hair" ? Yeah that but blue, everywhere. And carved mirrors, these dudes love carved mirrors for some reason.

Also frequent: little and not so little fucking altars to a miriad of small deities like saints or Gauchito Gil, Gilda, Difunta Correa, Maradona, etc

Also related: Check "fileteado porteño", formerly very popular in buses.

A very representative one shown here: https://youtu.be/qV8up2rQ20I

Edit: Holy shit it has its own wikiepdia page https://es.m.wikipedia.org/wiki/Colectivos_de_Buenos_Aires#Objetos_ornamentales Check the whole article, very cool