I made a salvia extract of unknown potency a while ago (one would have to smoke a about 1.5-2 full bowls for major effect) and made changa out of it.
It is nice, the amount of salvia keeps the mouth moist and allows for a slight feeling of body dissolving

I don't know if it is the salvia changa or just the DMT showing me something new; but I haven't had really any fractal visuals with this mix as I have with others, it is more flowing and expanding of space.
One thing I have noticed though and I'm not sure if one could achieve this with salvia alone, but instantly after inhaling I will feel intense burning pain anywhere that I have a wound. I found this out the hard way when I had a bad sunburn all over my back.... It actually brought an ingrown hair on my neck to my attention about a day before it was visible. It could prove quite beneficial for bringing health problems to the surface before they get bad in my opinion.
'Little spider weaves a wispy web, stumblin' through the woods it catches to my head. She crawls behind my ear and whispers secrets. Dragonfly whiz by and sings now teach it.'