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Sewn Paper Garland - Punch out a stack of stars from different patterned papers. Randomly arrange and rearrange stars on a large table. Run each star through the sewing machine. Grab a few at a time, so you aren't constantly stopping and starting your machine. Also sew towards a point, not from one, in case the point would get caught or bend. It takes less than 10 minutes.
Scrap fabric and string lights garland. This would be cute to use festive or holiday colors to decorate the mantel with. Could use pastel colors for Easter, purple black green and gold for Mardi Gras, green and gold for St. Patty's Day, red white & blue for 4th of July, etc.