Every time we hit Ji-Kun, I try to place a soulwell mid-air. There isn't any performance-breaking reason to do this other than pure amusement as raidmates try to "grab the cookie from my jar, young grasshopper." But it's possibly my favorite use of KJC so far.
This isn't an trick that requires super skill. Mostly, it's whether or not you can time your cast, your latency, and the wind that grabs you off Gastropod Boulevard.
But what I do like to do sometimes is watch elite players from the top guilds in the world do fights in a crazy or simply slightly different way. Usually this involves watching a lot of soloing videos: e.g, Spygnesy, who just uploaded a warlock solo of Ragnaros in Firelands. But when it comes to minor tips for huge meter wrecking, I love watching Sparkuggz of