Clustering techniques are proposed for developing performance of wireless sensor networks from several points of view. Multimedia nodes have different sensing region than scalar sensors that usually sense a circle or polygon regions centred by the node, and thus traditional clustering methods do not satisfy a Wireless Multimedia Sensor Network (WMSN). In this paper, a novel formation algorithm, Multi-Cluster-Membership (MCM), for multimedia node clustering is proposed. The proposed algorithm establishes clusters overlapping each other and the common members of clusters are coordinated to make cooperation among clusters. Therefore, MCM offers not only intra-cluster cooperation but also inter-cluster cooperation through coordinating members and also clusters. This differs from other coordinating ways in the fact that nodes may participate sensing in multiple clusters. We show the enhancement in power conservation efficiency of network resulted from applying MCM with respect the Single-Cluster-Membership (SCM) algorithm.