The tree lab is useful. Even though there are tons of trees on the net, with Bryce 5 the tree lab with the same settings, slightly changes each tree (if you don't duplicate just one tree). IOW if you click create (or load a preset) and depending on the randomness setting, if you keep the same settings for each tree you create, each tree will different from the one before so you don't have all the same tree in your scene. Besides that metaballs are great. Just take a look at the entries for this month's challange. Besides all the new render settings.