Take a walk or a hike and have each person pick out sticks to make the first letter of their name. The branch may already have a fork in it that helps them form the letter, or they may have to select several different branches to create it. Brownies may need more help selecting branches. Make sure the sizes more or less match up, be prepared with a small saw or other way to cut some branches down to size (most can probably just be snapped by hand).
Provide a large selection of yarns (great for busting your stash!) and have the participants wrap the yarn(s) around the branch to create the first letter of their names! This is a great time to practise some of the lashing techniques (see Lashing Out on the GGC Platform)!