Try using a computer, tablet, or phone as a sound effects machine next time you run a game. Get some appropriate sound effects and cue them up in a suitable program or app. Thunderclaps, pounding surf, the keening of an eagle, the background chatter of a lively tavern - all these things can add atmosphere to your game. You could even try mixing them with subtle mood music, or diegetic music.
To help you, there are several products available:
- Tabletop Audio produces ambience sound loops specifically suited for many gaming scenarios. Free to download, donate what you like.
- Battlebards is an online audio library plus cuer and mixer web app designed specifically for mixing and playing audio during a tabletop gaming session.
- Syrinscape is a dynamic audio generation app built to produce ambience and cued sound effects in a non-repetitive manner.
Palpatine: Anakin; you have dwelt ever in realms apart from the visible world.
Palpatine: And you know well the beauty, the terror, and the mystery of those obscure realms into which the inspired dreamer is transported.
Anakin: I... will... kill... you...
Palpatine: Fool that I was to plunge with such unsanctioned frenzy into mysteries no man was meant to penetrate; fool or god that you were — my only friend, who led me and went before me, and who in the end passed into terrors which may yet be mine!
Anakin: You can't... sfnnaa...
Palpatine: We live on a placid island of ignorance in the midst of black seas of infinity; and it was not meant that we should voyage far.
Palpatine: The prosaic materialism of the majority condemns as madness the flashes of super-sight which penetrate the common veil of obvious empiricism.
Anakin: Graalr, yruuaghr... ggnneerhh...
Palpatine: Among the agonies of these after days is that chief of torments — inarticulateness.