Some pommels definitely lotus blossoms, as the petals are distinctly shown. Others are more abstract. In the Ratanakosin period the pommels became essentially spherical, with perhaps a small button at the tip:
I see the possibility that these rounder ones might be representing the linga. A very interesting theory.
And what about this style? It looks like a conch, or a stupa to me:
It is a northern style (Lanna).