Trust me, i live in an orthodox Jewish TOwn. My town is about 1.8 square miles (about 15,000 people, about 9000 are jewish). In my tiny town we have 7 synagouges. 1 is conservative (the one that i go to), 1 is orthodox sephardic, 3 are orthodox ashkenazi, 1 is reform, and 1 is the local minyan where they are conservative but egalitarian and they play instruments during the service.
Paddy, Money does break Halakah on Shabbat and so does breaking things or ripping things. Egg bag is a good idea I never thought of that. I don't have a routine with one but i am sure that i could make one.
Daniel, They are orthodox that is the problem. Personally i would not care about coin tricks and such, but at these parties the women and men are not even allowed to dance together.
So, unfortunately my town is extremely orthodox which means i need to set my tricks to be shabbat appropriate.
I would re-read paddys post... as he ws refering to his suggestions, not your own on money and rippng. He was saying that what he suggested was not against the "law." - Egg bad, sponge balls, ropes, and cups. None of which you break or ripp from what I have seen. There is so many effects availble, just have to go out and search.
I say if your so freaking worried, then dont do it. Either get the gulls to do it, live and learn. Stop throwing up road blocks and excuses.