I just spotted the Keinu Swing from Finnish workshop Tunto Design at San Francisco store Rose and Radish. Made of layered birch plywood, it's so simple and stylish it would be great inside a home (space permitting).

Below: The Tunto Keinu Swing is available in green, light blue, or red for $250.

Below: A cheaper alternative, Ikea's Ekorre swing, made of acacia wood and polypropylene rope, is $14.99.