i have an idea that i think would be good, regional strouts. the idea is simple. when gathering a sprout from a tree, there is a chance for a regional sprout. You can then plant that sprout in a different region. when it mature, you the tree down, and cut it up into boards. this is where you get a change for a regional board. but instead it being a board from where the tree was planted, it is a regional board from the strout's region.
example: you have a chilling thicket pine tree sprout, and you plant it in central domain. we lwt it grow. it has mature, so you chop it down, and start sawing out boards. instead of getting central domain boards, you get chilling thickets boards.
if try gathering sprouts from the pine tree, you only get pine tree sprouts.