Icebirdcake is a major alliance formed in BB7.
At the start of the game, Raven wanted to put together an alliance with strong and trustworthy players to run the season with. He chose Flour and mirdo for their loyalty, and Celever as a previous winner who had demonstrated their skills before.
The alliance fell apart just as fast as it was put together, as a result of disagreements regarding the first eviction, and so no big moves were accomplished.
The alliance actually had zero success. Right on week 1, when the alliance planned to backdoor Jade, Celever went against the plan, seeing usefulness in keeping Jade around as a shield, and orchestrated Amici's eviction. This created a huge divide once the alliance learned Celever had gone against the group, and the fight between Raven and Celever that followed split the alliance down the middle, with Raven and Flour on one end, and Celever on the other. This left mirdo in the middle, but he eventually joined forces with Celever in other alliances.
Icebirdcake is widely considered one of the most chaotic alliances in PBB's history, with the fights that happened here having a huge effect on the course of the game at large.