One of the unusual options is to make such a flowering train.
A wall is cut out near the bottle, soil is poured inside and flowers are planted, or their seeds are sown. Holes are made on the side of the bottle that will come in contact with the ground so that excess water flows out after irrigation.
We fasten the caps from the same bottles as headlights - these will be the eyes, a smile can be drawn with a marker. Transparent bottles are painted in different colors. Wheels are cut bottoms of other bottles.
How much to use them, tells the fantasy. You can line up a string of such bottles with flowers - you get a whole train along the garden path, a frame for a flower bed or lawn.