I have seen several posts where people got signatures on fabric squares to have it made into quilts. I love this idea but have some questions. What kind of pen do I need for the characters to sign with? And what kind of fabric? Can I use Disney printed fabric or does it need to be plain? Should I carry a clipboard to put the fabric on for signing? Will the characters mind signing for all 4 kids (I just can't see them sharing their special quilt)? Any advice would be great!