for my first little, I did a big huge String puzzle that went ALL over the house (we all did actually) through and around all 4 floors, even outside!!!
it was a lot of fun, but a lot of work lol (this was at our revealing)
For my second little, I did clues where I said some true things and some untrue things, and made her go on a search throughout the house to the next location (after the statements about me) and she had to figure out where to go throughout the house in order to find me. I would use sorority history or stories that I know that we told her throughout her new membering.
We gave a small basket when we got our littles but they didn't get their HUGE basket until they got in. So, i'm not much help there, but I like the ideas that everyone else said