Background: we are clustering some (~500) ncRNAs based on their secondary structure. 2D structure is computed by RNAfold. Then, we compute a distance matrix of RNA structures by RNAdist and cluster it in R using hclust. We would like to plot the dendrogram in a way where the MFE secondary structures generated as .ps files by RNAfold are plotted as small icons at the tips of the dendrogram, to get a visual impression of the similarity of the various shapes. To my surprise, we were unable to find out how to achieve this in R/ggplot, ETE, or iTol. FigTree does not seem to be able to render leaf images either.
Could someone help us out with a recipe to do this?