Last week I was working on a new course (the first HouckDesign course in Washington state -- can't say where just yet). It's on an old ball golf course, and it offers several pin locations that I like even better than just a slope.
The existing bunkers make for pin positions where maybe part of the green is a nice flat area, part of the green is a gradual slope, and part of the green is bunker (everybody's putting up, or maybe up and over the lip of the bunker). When this course is done, there will be some holes with bunker in front of the pin, some with bunker behind, and some with bunker on either side. I think they will be the most interesting greens I've ever done and will create situations where you'll really want to hit a particular part of the green.
Right now, that's the best solution I've seen. Of course, I'll keep looking for something better.