Random 2nd Layer!

Normally, on a basic superflat world there are 3 layers, Grass, Dirt, and Bedrock. But now, you can have the second layer to be any block you can imagine! Here's how you do it: 1. Click "Create New World". 2. Name the world "Test".
3. Change the world difficulty to "Creative". 4. Click "More World Options". 5. Change the world type to superflat.
6. Click "Customize". 7. Click "Presets". 8. In the top bar you will see: 2;7,2X3,2;1;village. Change 2X3 to 2X__.
Here is a list of some interesting 2nd layer blocks and their corresponding numbers:
0= Air
43= Stone Slab
83= Sugar Cane
etc.
Test Your Own!!
9. Click "Use Preset".
Ready!
Please Give Diamonds!