Here's a template for your Christmas Trees, just adjust theoutline to get the style you want but don't change the inside slot positions. A dab of hot glue from a glue gun will help to stop them from folding flat together ;
10 idées de cartes de vœux à faire soi-même repérées sur Pinterest
Kid's Craft: Pasta Ornaments (These are actually very unique & pretty! None of that elbow macaroni glued to a cardboard cutout & sprayed painted gold crap that they had me make as a kid! No Pattern or Instructions.