Back in the day Painter (The Program) used to have a feature they called Garden Hose or Nozzles..I can't remember which. It used selectable sets of images in random orders to paint with. It was great for effects like creating bushes and rock surfaces etc.
I'm working on an illustration of a ski trail map and if you've ever seen one of these they are loaded with lots of little trees along the mountain slope.
What I was hoping to do it find a way to create the "Painter Nozzles" effect but in photoshop. Is there any way to have a group of trees as brushes or patterns that are random in height and size and spread as you paint with them? I tried creating a brush in PS CS3 but its monochrome and when painting with it I go a long series of blurred tree shapes that looked more like a pine tree in motion than a group of pine trees.