Blackbird is a large-scale object store built at Rocket Fuel, which stores 100+ TB of data and provides real time access to 10 billion+ objects in a 2-3 milliseconds at a rate of 1 million+ times per second. In this talk (an update from HBaseCon 2014), we will describe Blackbird's comprehensive collections API and various examples of how it can be used to model collections like sets, maps, and aggregates on these collections like counters, etc. We will also illustrate the flexibility and power of the API by modeling custom collection types that are unique to the Rocket Fuel context.