Ewest,
I was so excited last year, after we finished the entrance drive and clearing the pondsite, to see what the fall colors would look like. I was disappointed.
My hickories are Shagbark Hickory. The leaves turn slightly, but no show-stopper. The yellow that you noted in your Hick-pic is the yellow we get from the Ash trees. I have one big ol' lonely Ash directly behind the dam that is the color focus...past that, not much more.
The Black Locust offer virtually nothing.
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(edit)
OK, I am toooo picky about color. I had to google shagbark hickory fall color to make sure I'm not color blind. Yes, the leaves do turn a rich, mottled yellow color, but it's not the bright colors that I guess I hoped for.