Here is a small collection of some online resources to create or find visual materials for your research posters.
- Biodiversity Heritage Library (all public domain) on Flickr
- PhyloPic is a database of silhouette images of organisms available for reuse under a Public Domain or Creative Commons license.
- Science Image is a free library of science images
- Image Data Resource is a public repository of images from published scientific studies
- Creative Commons: Flickr Creative Commons and Wikipedia Commons