These rectangular, fabric-covered glass candleholders call for a clear-drying glue sealant like Martha Stewart Crafts decoupage which is suitable for outdoor use. The adhesive requires significant drying time, so allow a couple of days for this project. Use tiny scissors (needlepoint ones work well) to cut the cotton voile. If the fabric frays, spray it with starch and press before cutting.
If the thought of a cadre of frightful jack-o'-lanterns gives you the chills, opt for a lovely and luminous group of votive holders instead. These gently glowing lights, cut from pumpkins in pale hues, are easy to make: Simply slice off the tops, and scoop off the flesh.