I personally think fallen logs + rotten stumps should contain goodies inside them.
have them start with 2-3 ants, grubs, mushrooms, or maybe some new rare items such as "mirkwood seedling" or "fetid fungus"
would add some variety to an otherwise boring set of objects, as well as give some fresh players something to eat besides nuts and berries.
and on a related note: I would like to see mirkwood planks added so we can make variable material constructions out of mirkwood. this is where 'mirkwood seedlings' would come in handy