I used a bark texture from Lemog's free textures and converted it to greyscale in an image editor, a technique I learned from Tom Marlin. Here's an example which you can feel free to use, or at least experiment with if you like. Just click the pic and it will show the 512x 512 image. I applied a slight gaussian blur after converting it to greyscale, before importing into Bryce's terrain editor in the picture section. Then all you have to do is scale the resultant terrain down a bit on the Y axis and texture it as you like. HTH, Dan