RNALogo presents a novel graphical representation of the patterns in an aligned RNA sequences with a consensus structure. Several significant features, including sequence conservation, structural conservation, and the mutual information of base-paired regions, can be revealed within a RNA sequence alignment and its consensus RNA secondary structure. A web-based tool is also developed to provide a rapid, effective and highly configurable logo generator. A Gallery of RNALogo for Rfam RNA families is also built. Users can browse RNALogo graphs in this gallery to obtain further perspectives of known RNA families.