Trees are procedurally generated from a numeric seed. Use this page to view a bunch of random trees, and pick one that works for you. If none of these work, refresh the page to get a new selection.
Seeds are displayed below each tree, and can be reused in tree definitions. Note that size and length also factor into the generation. Length defines the actual length of each branch, and size influences the chance that a branch will have more child-branches. These trees use size 4 and length 50.
Length can be decreased to make your tree more compact, but changing size will result in a completely different tree.