Bronson Michael Miller:
Then of course some people use the subtle sensations or tingling/vibrating on the upper lip. So, like I said, it seems like anything can be used...I wonder if anybody uses taste haha
Not quite taste perhaps, but I used to use the tingling pain on my tongue from eating extremely hot curries as an object. This was one of my first insight meditations. I could literally "see" sensations as bubbles popping all over my tongue and I used it to train equanimity.