Window manifestations or graphics are usually either produced on a cutter plotter or a large format printer onto a variety of medias. Frosted window manifestations are cut on a cutter plotter then weeded by an operative and can be masked ready to apply your given design on the window.
For something more striking you would generally use a large format printer such as a Roland VG-640 or something similar. This type of process would enable you to print your manifestations/graphics in full colour. See the example above on our slider which would show this type of graphic print.