int z1 = 4;
int z2 = z1 + 8;
int yBottom = y1 + 4;
int yTop = y2;
DyeColor coreColor = odds.getRandomColor();
DyeColor detailColor = odds.getRandomColor();
// supports
chunk.setClay(x1 + 1, x1 + 3, y1, yBottom, z1 + 1, z1 + 3, detailColor);
chunk.setClay(x1 + 1, x1 + 3, y1, yBottom, z2 - 3, z2 - 1, detailColor);
chunk.setClay(x2 - 3, x2 - 1, y1, yBottom, z1 + 1, z1 + 3, detailColor);