I got an email from a friend, with a dozen or more photos attached, showing some of the ice and snow sculptures from the festival, though the email didn't say what year those sculptures were on display. Here are just a few:
The dragon picture gives the best look at the way the ice sculptures are done. Ice blocks are made and attached and then carved. It's incredible what they do with solid water.
The park in Harbin where the Festival is held becomes a city of ice, with buildings to walk through and statues to look at, and it's all lit up at night. Each year gets more elaborate than the past. More photos can be found through these links:
R. Todd King's photos of the 2003 show
China Daily's slideshow of the 2007 show, including some construction scenes