Last year we did a Harley Theme throughout rush.
A couple of years ago we did:
Get to know the sisters of AOX (icebreaker, played Jenga)
Club AOX (dressed up in "bar" clothes)
Around the World with AOX (had various foods, decorations, etc.)
We have also done:
Mexican Fiesta
Under the Sea (ugh...I hate this one)
The Wonder Years (50's theme)
Casino Night
All I need to know I learned in AOX
70's theme
80's theme
Lip Service-Kareoke
Pajama Jammy Jam
Greek Geeks
Disney Theme (I dressed up like Pocahontas

)
That's all I can remember right now.