Reinvent old light bulbs as tree ornaments by spray-painting them with metallic paint, then grouping together in clusters with ribbon. Smaller light bulbs work best grouped in odd numbers, while larger lightbulbs are best as single ornaments. http://www.hgtv.com/handmade/20-modern-handmade-holiday-decorating-ideas/pictures/page-19.html?soc=pinterest
Take pine cones and dip in white paint let them dry and they can be Christmas decorations. Use leftover white paint and put in a bowl on coffee table for a decoration that the dogs can't break (and hopefully won't eat).