I think I didn't explain correctly. I was asking about if your "non-voxels" can look more like actual voxels instead of "small boxes". Ken Silverman's Voxlap achieves it by "deactivating" shadows on the cubes, so they look "flat", making it more "pixelated".

Actually Voxlap does it because it's faster (it uses a sofware renderer) but I like the feel it gives to scenes, specially if voxels are small.