For 2D graphics, SVG (and more generally vector graphics) fit very well in git. For 3D, there are models, but there's still the problem of textures.

Is there anything close to a text-based procedural texture format ? Textures could be procedurally generated at startup and transformed into bitmaps. I am aware of kkrieger, but is there anything other than proof of concept ? No one takes voxels seriously anymore...