Something cool we did (I can't remember if it was during rush or not) was have one of our sisters who sold Mary Kay come in and do a mass-makeover. She sat us all down with plastic trays and little samples and she directed all of us in proper application at once.
It was a lot of fun, and granted it helped that we had our own personal Mary Kay rep, but what rep would turn down the chance to sell to a whole chapter of girls?