Usually props that mimic special traits are a no-go since it's kind of a loophole. A lot of older Dreamies got by with this purely because I hadn't set a standard, so they're just grandfathered in, though there are some that are legitimate special-trait zombies and stuff like that, and some that just have stitch-like patterns and the fur has been torn off their tail unnaturally. But Dreamies have a similar biology to humans, if you sewed someone else's wings to your back, you would likely just get a ridiculously nasty infection and jeopardize your life for it -- same goes for them in most cases, really.

Large effects that really take away from the core of the species appearance (extra limbs, mouths/eyes elsewhere on the body, etc) are just things listed under special traits. They -can- happen, but it's insanely rare, and I'd rather not have like, a bazillion Dreamies that don't look like Dreamies because people went crazy with stuff. I usually save all the weird extras for holidays, esp Halloween for most of what you mentioned.

Fangs though, that's fine as long as they're not like, massive tusks! They can have fully sharp teeth. Their eyes can also be fully solid colored, have multiple pupils or shaped pupils or whatever you like pattern-wise inside of them. Only the third eye has rarities attached to that regarding that. But as long as they have one mouth and two eyes where they're supposed to be, it's fine LOL.