The seed is Test(icle). Immature, I know, but my brother came up with it. My spawn was in the middle of a lake. I moved out of it, seconds later to find a heap of gravel fall around where I has spawned. In another second, I was hit by a skeleton's arrow from a dark area nearby. The nearby landscape is all mountainous, with floating sand, and it killed me twice. however, I found 2 clay deposits toward the sand which gave me over 400 clay balls. Later on I found a cave perfect for a home; a small entryway, the sea and a tundra nearby, caves... Everywhere I explored was amazing.
Amazing world