Every time I kill an assassin, I dump their bodies in the water. Covering my ass and all that. You never know, maybe it'll take a bit longer before the Dark Brotherhood realizes their assassin is dead?
I also always lay npc's who've been killed by enemies with their backs against some rock, and their heads directed to the sky. Some lavender or another kind of flower (dragon tongue if they were killed by a dragon) on their bodies or near their heads, and a bottle of nord mead next to their hands, and they're ready to reach sovngarde.

Well, the two dead revelers each got a honningbrew mead bottle instead.
Ah, and the old orc who wanted a warrior's death? I also lay him to rest against a cosy rock with his head directed at the sky, in a place where he could see the two sabre tigers he'd killed before, put a deathbell above his head on the rock, some lavender and nord mead, and guarded his body for a whole night with a torch in my hand (that just took way too long, dammit!).
I'm also kinda starting to take pity on the dragons I have to kill every now and then. Maybe I should leave a dragon's tongue on their bodies too?
Another thing my character always has with her, is nord mead. She simply can't live without. She even let Malborn smuggle it in the Thalmor embassy during the quest!

Oh, and bunnies, wolves and other wild animals? She believes they should be fought equally, with only your own power in other words. So she always fights them bare-handed. Sabre cats and bears are still a bit too much 'though, but running away also means you physical power is superior. ^^
Ah, and the love triangle quest in Riverwood took me a while. I followed each candidate for a whole day, to see what their everyday activities were (and their jobs), and broke in in their houses to see their worth. I ultimately concluded Camilla would have a brighter future with Faendal.
In Oblivion I played a Dark brotherhood assassin, and I left one flower of Nightshade on his/her body every time I killed someone. As a calling card. If possible, I tried to put an hourglass via pickpocketing on my targets 3 days before I'd kill them. Maybe I'll do that with my next character in Skyrim too. ^^