For no reason at all, I decided to check some themes that gets high voting count (sometimes more than once) but so far were not elected:

1 Corruption 694 2 Creation 593 3 End of the World 488 4 Construction 434 5 Death is useful 426 6 Break the Rules 406 7 Abandoned 405 8 End of the World 376 9 Randomly generated 359 10 Break The System 351

Source (from LD 16 – 30)