Fanfiction. Lots and lots of fanfiction. Shinji and Warhammer 40K (still ongoing after four years and still as awesome as ever), Imperfect Metamorphosis, The Shape of the Nightmare to Come, Interstitium, The Punishment, among many others (thank you, non-existent attention span), all of them clearly demonstrating the only difference between professional and amateur fiction is that the former has a publisher. Then there's all of the My Little Pony fanfiction I've found after becoming part of the herd, from It's a Dangerous Business, Going Out Your Door to Don't Let the Sun Catch You Crying.
I'm also currently working my way through the Gaunt's Ghosts books (yes, it's fanfiction) after purchasing nine of them at once, which I do not regret in the slightest.