Have you ever tried doing an egg treatment? I'm also no shampoo/conditioner right now, and on one of the 'not washing hair' threads, someone recommended this. I tried it once (whipped up an egg, worked it through my hair, let it sit awhile, then rinsed out with water). Felt pretty good.
Also, I haven't yet tried this myself, but I read about a banana milk hair mask on Crunchy Betty that sounded killer: