This mod adds partially transparent (translucent) glass. I will add ice soon.
License: WTFPL
Depends: default
Download (tell me when it stops working)
http://ompldr.org/vaWR2NA/translucent.zip
It needs the current dev version of Minetest to work (translucent textures do not work in minetest 0.4.6)
(no screenshot yet because I am on a computer that minetest doesn't work on)