I am giving a good friend a retirement party and want to have the guests sign in. What I want to have is a wall hanging of a tree (which will be the money tree---I am going to pin the money bills to the tree) with a cobblestone walkway next to the tree sort of making a path to the end of the wall hanging. The cobblestones will be where the guests will sign their name. I am going to use landscaping skills (???) and FMQ---especially for the cobblestones. Since this is going to be a finished wall hanging, is there a type of marking pen that will be easy to write with on this wall hanging??? Any other suggestions/tips/ideas will be greatly appreciated. I know there are ideas out there---this board is amazing for helping quilters out. Thanks in advance.....