I used some finger paint that I had on hand and put it into a freezer bag. Be sure to get as much air out of the bag as you can when you close it.
Tape it the table over a piece of white paper. If you skip this step then then the designs won't show up as well.
Megan enjoyed it so much that she keep coming back to it through out the day. An activity that we will certainly be doing again. The one thing I will do different next time is add a little more paint to the bag.
May your day be filled with joy and contentment!