Yep, that's a 10 foot tall tree made out of different diameters of steel round rod complete with colored bottles my mom collected from friends and a few she purchased from the internet.
She estimates that it cost about $300 for materials. $150 for the metal and $150 for the colored bottles. Lots more about my mom's DIY bottle tree (and where the bottle tree tradition came from) on the ol' blog. #SummerStyle