I found a really great seed it is called DIAMONDSTARTERS No spaces or lowercase letters it spawns you near a big ocean and sometimes if your lucky there are under water caves that you can easily find diamonds in. To breathe under water keep putting torches on blocks under water and when it pops of the block you will breath a bit do this repeatedly to easily get to the under water caves if the seed doesn't work keep the words just change it slightly I only tried it briefly
Hint #1 - How To Change World Name Without Deleting It!
Added 20 Nov 2012, ID #343
Firstly you must have: - An explorer (Recommended) - Or a Computer could do the work but it so long. First go to the directory where your game is. (on Android it is: sdcard>android>games>com.mojang>worlds>heretheyare!) Now right click or long press the World and rename it accordingly to your choice. Hope this helps!