|What if Spock had a goatee...
For me, writing fanfic usually takes the form of a short story length tale that speculates beyond an existing story ending that I found dissatisfying. Perhaps it is hubris to attempt to tweak a tale to ones liking, alas what kind of world would it be where we didn't have the ability to change things, if only within our sphere.
To that end, or rather to three different ends, I present a trio of my fanfic entries for your consumption. Certainly, I recommend reading the original source, each of which I found intriguing enough to inspire me.
Original: The Varieties of Religious Experience by John Updike (A September 11th inspired short available free online)
Fanfic: How Faith Almost Heals (super-short story)
Original: Enchantment by Orson Scott Card (urban fantasy novel)
Fanfic: Disenchantment: Trinity (short story) by Brian Bohmueller
Watchmen by Alan Moore and Dave Gibbons (superhero-noir graphic novel and film)
Watchmen: Reunion (short story) by Brian Bohmueller