I would love a Theme like this:
You must split your deck between 2 Clans. Leaders are not permitted.
We have decided to increase rewards for this weekend only:
1st - 5 Bonus Credits
2nd-5th - 3 Bonus Credits
6th-20 - 2 Bonus Credits
Instead of 1/3 of the tourney receiving 1 Credit, the odds have been changed to the following:
1/2 receives 1 Credit.
Even something small like that has some interesting feature.