Something similar happens already for lava. So CLNE/PCLN/BCLN/PBCN can be used to clone LAVA(TTAN) or LAVA(IRON) for example. The ctype of the lava is stored in the tmp of clone. This could be extended to ICE and SNOW, so that you can clone frozen DSTW, BUBW and SLTW.
But I only wish to see cloning of ice/snow with a ctype that can actually be frozen into ice/snow. No SNOW(LIGH) etc. For cloning lava, it is limited to elements that actually melt into lava.
Just using stacking.
EDIT:
Wait, read wrong again.
I'm bad at reading today.