I'm all for this concept, but in a way that makes sense within the context of the game - things that are relatively easy to find, evenly distributed and rewarding. Say, for example, that you're EVAing on the mun... at the moment, it's a case of hop out, take a surface sample, stick in a flag, jump back in, job jobbed. If I've got a rover it's realistically only so I can go to a nearby biosphere to do very much the same from a science point of view (discounting the natural desire to do doughnuts or drive off the edge of craters, of course). So far, so standard. So... what if, on the way to the next biosphere, I see something interesting? An unusual rock, for example? Out I hop, pick it up, and up flashes the ol' science text box saying something along the lines of "Odd... A quartz rock in a silica region - what's this doing here, I wonder?" (+10 Science), or words to that effect. Evenly distributed at random on the surface of a planetary body, with an occurrence of 1 per square kilometer or so. In effect, small items within the context of the game that are rare enough to be unusual when you find them, but not so rare as to stop people deliberately searching, exploring, and generally nosing about. You probably won't find one but it's a nice surprise when you do. It also helps prevent the grind of checking off every biosphere on a surface and running the familiar routine: "Crew report? Check. Surface Sample? Check. Mystery goo, Science Junior, instruments? Check, check, double check. Right, done. Ah well, no need to ever come back to the Midlands again..." There's always a reason to explore. and keep going back. And keep launching.