I'm a big fan of little big planet 1 & 2 and have been creating levels for some time.
One thing I try to always remember when I'm making a level is to try and do something different every time.
I've created many levels but I have only published three levels to date:
Sonicrumpets slowly falling rush-in blocks challenge
Test your skills with sonicrumpets tetris inspired survival challenge slowly falling rush-in blocks. How long can you last?