Implement them one at a time. See how they work.
Different trash tournaments can try different things
(Alexis' idea of everyone having their "lucky" tossup is a
good one) ...
Another thing to consider are
bouncebacks and bonus sinking ... both of which are going to
be done at CP2 ...
I'd say go with the lucky
tossup idea. Each player writes on an index card her/his
lucky tossup and then gets 25 points for getting that
one.
Shawn