I agree with you Kenny on lighter colored limbs on a dark riser unless both are light or dark.
You are correct, 1,3,& 4 are stabilized walnut.
I hesitated putting that sample in 1&3 because I'm pretty fond of them myself.
They came from a small 10" branch that had a wicked 'z' looking bend in it. I ended up with (3) 7/8" small slabs out of it after truing them up.