Not long ago, I told you about the new wiki to collect and share histology images among A&P teachers.
Another great site with histology images that are FREE to use for noncommercial purposes is Blue Histology from the University of Western Australia.
You can find other links to FREE images to use in your PowerPoints, tests, lab quizzes, web pages, tutorials, etc. at my collection of free image links at The A&P Professor website.
If you have additional contributions as I build my collection of FREE images, please pass them along!