They make nice display pieces, especially the larger ones. I do have a 1000 ml one that I plan to keep. Photo is in my BN albums.
It could be a vase for a few rose buds. That would be fitting for the flacon of a rose fragrance.
I suppose after I'm tired of it I might eBay it, someday.
At a perfume shop here in CT I saw some flacons of the same green color and shape as the 8.4 oz. Creed bottles, with a label (not Creed) sold empty-- never had juice in them-- just as decorator items. They cost about $35.