@Bobby: we're working on a 'perfect' workflow, so up till now every tree has it's glitches. In that sense it's not a finished 'product'. Replacing the simple trunk by an elaborate one is not too hard, but remapping still needs work.
@Kadri; that's an interesting idea, but a bit difficult perhaps, as the olives will also grow to fat branches and trunk if these are not separate objects. And they will cross leaves. For a more distant view simple flat polys with an olive texture will do quite nicely, I think. I did think of making a sitting bird, though, that can be populated into a tree, though some will sit awkwardly on their branches, no doubt.