This is a tile shape I like.

Up top is my linear ramp, f(x) = Gain(theTile, .36)

Given this rounding Corner function: (4 nodes)

def Corner(x, k) = (1 - (1 - x) ** k) ** (1/k)

I then used:

Corner(f(x), 4)

to produce the bottom shape.

I'm showing you k=4, but lots of different values of k are possible and interesting results abound.

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)