I have a whole chapter of swapping pin ideas in my free leader's guide, I Am Living My Faith. It is a free ebook available at ebooks-online.com, and includes all the activities I did with my Junior Girl Scout troop when we were earning the religious emblem, I Live My Faith. You can get a copy at:
In the back of the book, I've included patterns for SWAPS (Something Wearable Affectionately Pinned Somewhere) that are made from recycled or inexpensive materials. They seem to be a good craft project for this emblem, because so much of the focus is on being a good friend to others.