Great thread, lots of wonderful trees to gawk at. I'm a sucker for flowering specimens which will likely show through in my choices..
1- My favorite tree of all time, a very famous Chojubai. Sprawling, lush, fertile, and yet it has such age. This tree takes me away to a different setting, which I think great bonsai should. It reminds me of a setting taken from the movie 'Fern Gulley'. This tree in my eyes is perfect and as it grows and changes the dynamics will only improve IMO. Its bewildering to try and wrap my head around the many decades of training this tree has probably endured.
2- Another Chojubai. I like the strong trunk and amazing ramification. It reminds me of the old gnarled fruit trees around where I grew up. My friend had a seemingly ancient wild cherry in his yard that instantly comes to mind when I look at this. Again, very healthy and elegantly lush.
3- This I believe is a forest planting of some type of Ficus. I stumbled on this photo floating around on the internet and from what I understand these plantings are located somewhere in Thailand. Perhaps a 32 hand bonsai? I love the sheer size and could imagine standing in front of this and instantly being taken away on a journey through a dense tropical rain forest.
4- A flowering Crabapple. Malus Zumi. Wonderfully gnarled and weathered trunk that tells a wicked tale of survival, absolutely love it. I do not know who trained it, I believe its Japanese. Living in the north I cant help but love deciduous trees and all the seasonal shows they display.
5- A Prunus Ume. Again, a delightfully aged trunk and beautiful branching. I really like the proportions of the small pot to the larger tree. It has obviously seen many more years than I have. It would be a privilege to see this tree and its year round show and the changes it displays throughout the seasons. I also do not know who trained this tree.