World of Tanks Update 1.11.1 Common Test has some hidden 2D styles for upcoming events on specific regions.
The first one shared today, is what I believe an exclusive for the American Server, the “Carnaval” style is inspired in the street carnival of Rio de Janeiro and is designated by Guinness World Records as the largest carnival in the world, with approximately two million people each day.
Carnival is a Western Christian festive season that occurs before the liturgical season of Lent. The main events typically occur during February or early March, during the period historically known as Shrovetide, or Pre-Lent. Carnival typically involves public celebrations, including events such as parades, public street parties and other entertainments, combining some elements of a circus. Elaborate costumes and masks allow people to set aside their everyday individuality and experience a heightened sense of social unity.
The style is classed as unhistorical, costing 1,250 Gold in-game and can be used by any vehicle of any nation.