It doesn't look real, but as far as we can tell, it is. The different layers are formed by algae (green) and sediments (yellow, brown), or by a rapid melting and freezing (dark blue).
This photos were taken by Oyvind Tangen, 62, a sailor on board the research ship G.O. Sars in the Antarctic ocean, and by Leif Nøttestad. ::The colored iceberg - the beauty of the Antarctic, ::A marbled iceberg, ::Rainbow iceberg in the Antarctic
More photos below.
Beautiful, isn't it?