I definitely get an underwater feel from this, and that white pattern in the middle is perfect. I can imagine it being like one of those patterns that, when water covers one part, another "appears" somewhere else.
Yes, I think I do Like how ripples leave the surface in an area, but it doesn't mean they've died out, they're just expanding elsewhere? I think something very similar works for gnarls, except that in this case the "gnarl ripples" don't extend, they just move around. Thanks!