With Update 1.7.1, and only for its duration, two new 3D styles are available in-game for gold! One for Progetto M35 mod. 46 and one for the AMX 50 B, each unique in its own way.
The new styles are available in-game via menu Exterior, Preset Styles until Update 1.8. While these styles might look cool, they are not cheap. If you want one, you will have to pay 5,000 Gold, for the AMX 50 B style, and 2,500 Gold for the Progetto M35 mod. 46 style, but if you still have a large reserve of Gold from Holiday Ops 2020 boxes, then these might be a good purchase if you really want to style your tank.