I wonder what could be a nice routine for a rising tie
I thought I can try to levitate my zombie and instead of the zombie rising the tie would go up, but I am afraid that the anticipation for the ball to rise will make the tie rise to be disappointing.
What do you think?

I think the rising tie is a gag. Not really a magic trick in itself. I have seen it used to great success as running gag. Everytime the magician was surprised by something, his tie would fly up and he would make a surprised face. The kids loved it. What if you try to make the zombie rise, the tie rises instead, do this twice, then the zombie does it's thing. Then at the end of the rountine, as you are taking your bow, the tie rises again. You've got comedy in three's, and you've got reincorperation.
Edd

The rising tie could be used multiple times during the show as a gag. If you had a tie which said "Lie Detector", it would rise every time you said "There is nothing up my sleeve."
You could use it as a warm up. Have the children clap and cheer. The louder they cheer, the higher the tie would rise.

Using it before the Zombie could be funny. Especially if you told it to "Stay down Tyrone, I was talking to the magic ball" and it kept dis-obeying.