Never expect rewards for this kind of stuff jajaj
Getting rewards for completing parkour is a very fun thing yea, it's a great motivator to explore the main lobby as well and not just play the games. But it's also understandable that you don't obtain a lot of loot this way, since cosmetics are at the end of the day still the biggest selling point of a lot of ranks and bundles you can buy.
as far as i know, the only way to obtain cosmetics for free is through hunts and parcours
And you also get them for Cube's birthdays. At least there was a free cage last year if I recall correctly.
Forgot to quote the parkour cosmetics messsage, the question was from @ItsJustWildd about parkour rewards.
So yea, both of the parkours are very cool, but they are sadly rather short. The rewards were already mentioned by
@pekd ([Tower] prefix and Cityscape win effect) and their names are Rooftop & Tower.