Great for small candles .
I would prefer simple round candle , 3-4cm of height , and i would dare it in white colour if i had dark background or if u like goth try a black or grey candle .
You can also put 2 or 3 bottles together .
In that case , u can buy 1 candle and cut it into 2-3 pieces , so it ll match with the "hippy " style of the bottle.
Great as decoration
On the other hand , you can just place 2-3 together on a furniture near the window, so as the sunlight changes , in the same way the colour and the shadow will change the layout!