What decade or time period would fits your equids or their style the best? (For instance, the 80's or 90's Grunge, or even like Medieval)
Timeline-wise, pretty much all of mine are modern, or at least somewhere in the late 20th century, in America or with American troops overseas. Though I know it's way off by several decades, I simultaneously see Benny (who has the most contact with time-sensitive stuff) racing through trenches (WWI) or the desert (Gulf War, Iraq, Afghanistan, Pakistan, Yemen, take your pick). I also seem to lean more toward desert camo for him when I think of his harness, and give him modern medicine packs, but at the same time, I throw No Man's Land in his path, and give him the know-how to navigate other hazards of trench warfare - a waaaay outdated form of combat.
I also have Impala, who is named for a car that started being made in 1957, and Kahn, who was named for a character who first aired on Star Trek in 1967. Gallifrey wasn't named in Doctor Who until 1973, Trenzalore wasn't mentioned=until 2011. So by all means, we should be more modern than that in my herd. ID Benny shouldn't really be thinking about trenches, I suppose.
Style-wise, the only ones out of place are Gallifrey (Victorian), Wendigo and Focalor (1800s Wild Westish).