1. A non-transitory computer-readable storage medium having stored thereon instructions that, when executed by one or more processors of a computing system, cause the computing system to at least: associate a first classification identifier with a collection of computing resources that are hosted by a resource provider under the direction of a customer of the resource provider; receive a request to provision one or more computing resources, the request specifying one or more relationships between the one or more computing resources and the collection of computing resources based at least in part on a second classification identifier designated for the one or more computing resources and the first classification identifier associated with the collection of computing resources; in response to determining a set of available resources that have the specified one or more relationships with the collection of computing resources; fulfill the request using the determined set of available resources.