Sorry to get to this late, but... * Yes, the Yucca has always done that little color-change trick, and the lower leaves usually have a grayish appearance. * Laurie is absolutely correct in the simplest way for getting one of the veggie materials to your paint program to modify or redesign. * There are different map "layouts" for different plants/trees. Some of them share similar layouts, and exchanging leaf material between them works out well. For instance, the fern, fir tree, tropic, and dry weeds all use a similar layout. Most of the deciduous trees use a similar layout to each other. This means you can use Fern leaves on a Tropic plant, or Maple leaves on a Plum tree, without changing the basic characteristics of the plant/tree forms. Hope that makes sense. :)