I too love the rock one! At first I didn't expand the photo, so thought hmm, nice, but once I expanded photo and saw what it actually is I was saying "WOW!" amazing and the roots are so thick! I'm sure that plant is years old!! I have a bonsai book that has many color photos of older chinese and japanese family trees, many above 250 years old!! Again I say amazing!
I don't have that kind of patience, and I don't have anyone to pass them onto
I think I'm going to try a forsythia, since I have some rooted cuttings, also have rooted cuttings of hydrangea, don't know if that would work, but I feel like I've seen bonsai hydrangea before??