Is this a good idea to give to a sorority??

I am in a fraternity that is brand new, just started up this year. We are not well known yet, so it is best to get on some sororities good side. We made cookies and cakes and and all that stuff. But I have my own idea and I need advice to whether it would be a good idea. I am thinking of making a valentine-like card for the chi omega sorority. I printed out all these pictures on the internet of their mascot, and badge, and color, and all that stuff. I plan on putting all those pictures in the card, writing some nice stuff to tell them that we hope to get to know them better, and decorate the card with glitter and stickers and all that. Then I plan on leaving it in their mailbox of their chapter house. Is that a good idea or not?? Would it look strange?? I plan on making it myself, but on the behalf of my entire fraternity.