I started some back early in the spring. Most were existing scrapes from past year but I had luck starting new ones. here's a link to my original post on the subject.
http://forum.hunting.net/asppg/tm.as...mock%2Cscrapes
I haven't touched them in months and all that took hold are still showing signs of use. I haven't set up a game cam on them in an effort to not disturb their normal activity but I just got a 500 event trail timer that I plan to set up over the most active scrapes to see just how frequently they are being used.