I recently got around to finishing some sonifying examples available [here] demonstrating various filtering techniques i've been playing with, the first method allowing you to isolate and sonify specifically selected colors within an image.
The Second method applies to filtering objects in 3D environments, it captures images from both the frame and depth buffers, then isolates an object via its solid color from the frame image and uses it as a stencil to cut out a region of the depth buffer for sonifying. This was one of the idea's I'd had with Audiocraft for isolating specific resources or objects. For example, in minecraft there are over 200 different block types, but using this method you could isolate something like coal so when you sonify the area in front of you, only coal would appear, or you could set it to only sonify enemies, switches, or highlight other important objects within a 3D space.
The third method is a localized sonified mouse cursor, where it sonifies a small area around the mouse, representing its position in the soundscape. This particular method might be quite useful for 2D point and click adventure games using a depthmap as a backdrop in place of a conventional scene.