Need some tri-Delt help

[DocWhoRocks]

So here's the situation....

Met this girl via the internet, we talked over e-mail & chat for a couple of weeks. Then last weekend we decided to meet and go out for lunch. We had a really great time and then spent most of the weekend together. And we're going out again this weekend. She's a tri-delt and the house manager. Her sisters have been giving her a lot of crap for an "internet boyfriend".

Here's where I need some help...
Since her sisters are giving her a hard time(hooking up with a guy over the internet) I want to do something that will really make them jealous of her hehe. I've already sent her some flowers and that helped But I was thinking maybe of doing something somehow related to the tri-delts? Maybe someting I could do/make with one there symbols like the dolphin or pine tree? I'm not in a frat so I don't know too much about the greek life. So I was hoping that somebody out there might have some ideas?

Thanks for any help/ideas anyone has!!!