Making a Wall of Hurt

[herrhauptmann]

I just wish there was a way to combat the Tumble Check to Avoid AoO...

SInce the tumble check is a flat DC, it gets easier as you gain levels. Quickly should be impossible to fail.
So how about a method of making difficult terrain? It doesn't stop the tumble to avoid the AoO, but it does make it more difficult to tumble.