Yeah! Flagging is the tool of choice.
I carry a few strips of heavy flagging ribbon tipped with reflective tape that I can hang in a tree or on a tripod of sticks, that help me home back in on a spot in the dark. By the time I follow it to wherever it stopped, I want to be able to home in on it as well as I can for the pick-up. Anyone that knows what a Remove Before Flight ribbon looks like, knows what I am talking about. Dead easy to home in on, and makes a great marker for those 'return in the morning" visits.
I like the TP for marking blood spots idea.
I had one recovery where the buck ran arrow straight, spraying good blood, then vanished completely. I did a circular search pattern for about an hour, traced and retraced the spots of blood and hoofprints. Very frustrating.
Found him 4 hours later, after I went for a walkabout. Followed the Ravens in to him. From where he ended up, I concluded that he had to have made a hard 90 degree turn right after he went down over the rise, then crossed a creek and died wedged between two fallen trees.
Never did find any other blood signs. A coyote had opened up the side of the body cavity, and there was a mess from the birds, but he was still recovered and I didn't lose enough to call it a loss. Was pretty PO'd about not being able to find him though, and cut my trip short over it.
I guess the tip is, watch the birds. Ravens, Crows, and Magpies' all know free eats when they see it on the ground.
A summer shooting gophers will tune up the marksmanship, too!
Cheers
Trev