We had a wishing well if people wanted to give us money. Other people gave us gifts. Either way we were happy with - whatever they felt comfortable in doing.
I'm not the type of person to judge people on how much money they gave or anything.
I was annoyed that there were people that came to the wedding that didn't get a card or anything. To me, even a card would have been nice to acknowledge they were they and were happy for us and happy to be celebrating with us.