Well, I may be grasping at the straws, but brown isn't uncommon and if you use plates and tiles properly you can get a pretty impressive tree. But you can also go to the lego stores where you try to cram as many legos as possible in one tiny bag; I got over 200 plant peices(most were flower stems/long grass peices) and some trans bricks for about 20 bucks.
Just my thoughts on the matter...
