What you would see in a wormhole?
Around the worm hole would be a region with an intense gravitational field, and there would be gravitational lensing occurring, similar to that around a black hole. The difference would be that light that has passed through the worm hole would would be visible. So, a distorted view of the "other side" could be seen.

This physicsbuzz article has some images and discussion. Note that the wormhole would be a spherical region in space, and not a 2d "stargate"