The trees are pretty straight forward. The still green fiber on the left is as pulled straight from the bag, in the right after gently rolling between palms of hand. The color is a little off in photo but they are black, rust (dk. reddish brn.) and dk. brown. I use whatever primer (cause it's flat and dries fast) that is on sale at the local auto parts or hardware store. I'm in n-scale so I make em' 2 1/2 to 4 1/2 inches tall (approx. 30' to 60'), in HO you would need 5" to 9" (to tall for toothpicks but you can get bamboo skewers at the grocery store). I use several shades of Woodland Scenics coarse ground foam. Burnt grass, Earth, Light Green and Dark Green (go easy on the Dk. Green as it can be overpowering). I DO NOT MEASURE, the forest is not all the same shade so I figure my minature one shouldn't be either. I just dump some of each into a bag and shake well. Then grab the end of your fiber "tree" with the tweezers, spray with paint, stick in bag and shake like crazy. Do this of course outside or in a well ventilated area. I wear those plastic disposable gloves to save clean up time so once I pull it from the bag I take it from the tweezers toss into a box and repeat the procedure untill I have had enough!! Usually about 45 min. will produce about 50 to 75 trees. Don't kill yourself worrying about the shape or bald spots. You will only be able to see the "tree" from a couple of angles once it's planted so you can usually rotate to solve the problem. If not trim with sciccors, spray bald spots with cheap hair spray and dip in foam. To make Kudzu (could also be Ivy, Honey Suckle or whatever) I stretch out the fiber in to a thin mat, then do the same thing as the tree.