For the hunt:
Option 3: "Show 
me..."

Why? Because like you said, everyone loves these. 
I think it gives people a chance to really get 
out there and explore. Also the fact that it 
allows more points for creativity means that 
people who have smaller or less visited galleries 
may get more traffic. That way everyone wins. ;) 
As for the images clogging up your mail box, you 
already came up with an answer for that. In the 
rules state that entries must contain URLs only, 
otherwise they risk being disqualified. 

(This option also works well because it saves you 
a lot of time and effort asking owners of 
different galleries to participate)


The End:
Option 1: Advanced math 
finally put to use

Why? Because it's the only fair way. To have 
riddles or trivia questions will come down to who 
knows the most about the widest variety of shows. 
A lot of people have only a couple of favorites 
that they center on and may not know enough to 
even come close to answering trivia questions 
that don't involve one of their favs. It also 
seems like a fast and clear way to choose a 
winner. Imagine if two people continued to answer 
the riddles or triva questions correctly, I can 
see the flame war now. *ugh*

Anyway, those are just my humble opinions. Feel 
free to accept them, reject them, or poop on 
them. :)