The Might,
That's a very nice idea. In terms of which trees might be best for Laurelin and Telperion, the Tolkien Society and the Mythopoeic Society paid for two trees to be planted in the University Parks in Oxford in 1992, the centenery of Tolkien's birth. The tree chosen for Telperion was a silver-leafed Maple (on the right) and for Laurelin a False Acacia (on the left):
http://users.ox.ac.uk/~tolksoc/Tolki...two_trees.html