I recently completed a music pack titled Tension and Suspense. For this I have used typical classical arrangements, as well as add some creative sound design through synthesis. The goal was to create sounds that would reinforce harmonies and melodies without taking-over the composition. Small details and reverberations that sit under the composition help add to the atmospheres that draw your mind into the feeling of the piece.
Alongside this the music music be recognizable, but not over powering. I was not making epic scale orchestral hits, after all. Constant restraint and lack of resolve in the music allowed for the feeling of tension to be high, yet subtle.
Please keep a look out for more of my work in the future.