Creeping in my Soul always had a really haunting tone that I absolutely loved. It really matched the mystery and intrigue of 2007, the lyrics were nice too.
Gravity Hurts was also pretty awesome, it had this really cool "The Nuva are back *****es!" vibe that was just awesome with the accompanying shots of Lewa, Pohatu, and Kopaka soaring past Tanma.
Other then those two, Cryoshell songs were just okay. Bye Bye Babylon was kind of disappointing personally, and I never really got into the other songs such as Face Me or their remastered versions of Creeping in my Soul and Gravity Hurts ( although Gravity Hurts was great, the tone was completely different).