Bottle trees are said to capture evil spirits. Here is the legend at Texas Tin Lizard, "Evil spirits are drawn to the glow of colored glass, especially blue wine bottles. They enter the bottles and are trapped inside, consumed, and converted to goodness and radiant light."
Oilcloth and laminated cotton are great fabrics to decorate inside and out, especially if you have a busy household. It's so great to just wipe it clean! Not limited to the old nostalgic 50's patterns, there are many new bohemian patterns. A great source for oilcloth in the Austin area is El Interior. Online sources are etsy-laminated or etsy-oilcloth addict.