My wife and I found that humming when doing oral sex can heighten the pleasure. There's something about the vibrations from humming that stimulate her clit. I love it on my cock head.
The only one I could add that I experienced with a woman was while she had a cup of hot tea. A mouthful then suck me, anor]ther mouthful, then suck me. It wasn't as wild as I thought it would be. The only one I haven't experienced is an ice cube. Most of the beautifully imaginative cock sucking was done only by the one bi cock sucker who I visited when horny and at my wits end. In one session simply standing in front of him with him doing all his magic, I came hard, he kept on hungrily working my cock around in his mouth for I don't know how long and I shot him another load. I wish he were still alive or better still his female cock loving counterpart.
I do remember an afternoon with my man that I used ice cubes and hot tea while sucking his cock. He loved it as I'd suck him with an ice cube in my mouth until it melted away to then warm my mouth with hot tea and continue sucking his cock. My first wife did this to me and it was fantastic, so I wanted to share it with him as well.