As customized worlds are going to be unsupported as of 1.13, I figure I'd have some fun messing around with the values. I tried setting some to -1, some to high values (I mostly used 2^31-1 or 2147483647). Here are some cool ones I found.
I actually made this one a while ago (Notice the date on the bottom left of the picture [Also please don't ask about the things on my taskbar or why I didn't just press F2]). I set some values to -1 and the world turned out amazing. I named it "Nearlands" because I thought that the world was pretty glitchy-looking, like the farlands, except the glitchyness is everywhere.