That´s good point.
I started a level using 7th Lavafall, awesome metallic tileset. I´ll see if I still can create levels, since it´s been months since I created a brand new level and finished it.

All games I create levels with, for example Serious Sam, I´m the same person there, I created new maps but with same style as the ones in the game itself.
This tells that it´s my mapping style, it´s very hard to change one´s mapping style, because if you map against your will, you get bored pretty soon.