If your Christmas lights don't work, you can recycle them or repurpose them for other decorations. Some places have Christmas light recycling programs where you can take your old lights to be recycled or repurposed. Alternatively, you can use the lights as decorations for other holidays or events. For example, you can string them along a porch or fence to create a festive atmosphere, or you can use them to decorate a tree or shrub. You can also use them to create a unique piece of art or craft project.