First, I pick up one of my go-to books, A Continual Feast
I still can't find out whether or not this woman is indeed Catholic (She does support Opus Dei, so, I guess?) but regardless, it's got some great bits of info to help you celebrate, throughout the Liturgical Year.
The Holy Thursday section says:
So, like I said, green jello.
Then, I sat and thought a bit about Holy Thursday itself (yes, the little ones watched their share of Alton Brown and PBS today while big sister was at the Chrism Mass). I think tonight is the night we will wash our childrens' hands (DH wants feet and he will probably get his way since it's more accurate) at the table before dinner. We will also break a loaf of rosemary wheat bread that is currently baking (I can see why people use this TV thing!) and have some "kid wine" to commemorate and learn more about the Last Supper.
DH is kind enough to not leave me home with 4 little people at the moment and head to Mass with #1. I'm sorry they will miss it but I guess it can wait a year. Hopefully some part of the evening will plant a seed in these little people, especially if we make it a tradition. I'm not trying to raise experts (although that would be nice) but I want the base to be wide enough that they can build solidly upward as they grow.
Enjoy the evening, however you are blessed, and if you have a moment go read this This is how God is. It's lovely.