Yes, you could potentially apply a "wind force" to everything in your game, granted your game would tick along at a smooth 2 or 3 FPS.

Like any physics calculations, they tend to get pretty intensive the more of them you run. While this is pretty mild as far as the processor requirements go, when you begin applying it to everything - it adds up quickly.

It isn't really that unique anymore though. Most games that can afford the CPU time have wind effects now, and if you really wanted to get crazy you can add the effects to various character model parts to have them move with the wind (hair, capes).