Speaking of Death Note BL doujins, someone in our country made an original Death Note story that mixes characters from almost every single popular anime you can think of.
The quality is good.
Spoiler: Too long to be tolerable (click to see content)
Bleach,
Detective Conan, Angel Heart, Naruto, One Piece, Dragonball, Detective School, D-Gray Man, Full Metal Alchemist, Hakuto no Ken, Yu Yu Hakusho, Zatchbell, Samurai X, Gintama, Inuyasha, etc.
Plot's about somebody got a Death Note, but it isn't Light Yagami.