Shiv-Ling is a form of Lord Shiva. People worship Lord Shiva in this form. The month of Shravan (generally comes around August) is known as the month of Lord Shiva. During this month, all temples of Lord Shiva are full of their worshipers. They decorate temple & offer prayers.
In this Short Documentary, you can see Shiv-Ling which is prepared from Ice. Rest you can see Brahmins offering prayers with Shlokas to Lord Shiva & other people joining the same. This was taken sometime in the year 2009.
Short Documentary – Shiv-Ling Made of Ice