The top 2 are very good as are the last two. Frozen lake hmmm... I've been wanting to do one myself but have not even tried it yet. Have you looked at the setting the water textures to whites and light blues? The colors set to 'ice' and a very smoothed out wave setting may be what you need.
Here are a couple of links you might find useful:
Planet Terragen
WaterWorks Plugins
