Before one of the sound systems for roll20 went under, I'd use it for music that I felt fit the area; now I mostly just use YT. Hell, I design a lot of ideas and concepts just by listening to music, envisioning the area, forms of enemies, or boss. I find I'm most creative when I do this.Random question for the Gm/Dms out there.
What extra stuff do you do to enhance your game?
Im planning on getting some sound systems to play old might and magic music,
And have considered modifying the lighting (though that would be a hassle for reading, so its only a loose idea).
I am otherwise slowly printing out 3d magnetized tiles for better dungeon delving.
I also usually fly by the seat, but for a campaign I sadly couldn't continue due to my own flakiness, I had a master document including my homebrew rules (mainly stats for mass combat and guns as it was a Napoleonic Era game) as well as lore in the world so far. That Master Document was useful to me and my players quite often.