I personaly love this type of things in any game, as it's something to do when you want to take a break and stroll around a bit. Anyone that is possesed by the collectors devil will like this aswell.
I know I want something like this, but have no idea how it should function.
So, do you want "hidden packages"?
What should they be?
What kind of reward should we get for collecting them?
They can be lore friendly of course.
Now, before you say "go play GTA and leave Skyrim alone" think, 100 things to find could be fun, but do I want it?
Edit: It's very much like the Nirn roots, but in very different locations (not only near water) and much more diverse rewards.
Edit: I'm looking for something that is totally detached from the game. Like in GTA III. No quest involved. The question I'm asking is if you want this and how to implement it?