I used the STTNG ep "Yesterday's Enterprise" as inspiration for a deity-level time travel scenario plot, "Yesterday's Thrin", which involved Thrin travelling into the past to prevent the bad guys changing the future. It worked pretty well.
I use relatively few plots directly, but lots of NPCs are inspired by genre sources - eg an urban scenario with characters inspired by the original Batman movie, with a Jack Nicholoson/The Joker character, a Jack Palance/Carl Grissom character, etc.