Welcome Chi Oqt!
When I was a pledge we didn't have a skit like you were saying. But we got them flowers, made cookies, tagged our big's car, and just did little sweet things for them to thank them for C-H-I-O week.
I have found that paint pens are a necessity for every sorority girl! They're the best things to use to personalize ANYTHING! Picture frames, photo alums, vases, cups, tupperware- you get the idea.