Hello Ariete - and welcome to the GMB. These look interesting pieces, although regret I can't really help with anything positive. It's just possible it might help people here if you tell us where on the globe you are, and where these were acquired from. Just some thoughts...when you say milk glass, are these really only opaque pinky/white glass, or by any remote chance might they be opalescent/opaline. The bulbous shape of the 'vase' looks nouveau to me, but that doesn't guarantee they were made at the turn of the century to 1915 - possibly copying a slightly earlier style, but to my ignorant eyes the design (of the vases especially) has a Continental look.
Then again, the four leaf clover might mean Ireland perhaps.

Let's hope someone with real knowedge is able to help.