It pains me to hear of miniature pieces being chucked to bin rather than bits box, even when they are found to be rather lacking. Then again, I accidentally ended up binning today couple of small plastic parts that I had just cleaned of mould lines - luckily I discovered my mistake a few hours later and manged to recover the bits from the bin.
For another source of bit spooky looking plastic Citadel trees, the Walls and Fences set (re-released for ToW, with two sprues per box) contains couple of smaller dried trees - they are part of the wall strips, but can be cut off and glued on their own bases (I just stuck one on 30 mm steel washer to keep it stable).
Some of the walls themselved look like they could make for decent graveyard walls, and there is also a signpost with a raven sitting lonely on top.