Blender offers so much in one package that it's always tempting to see what else it can do. "handlebar", from the CGTalk forums, has found two very clever ways to quickly create excellent iris textures using Blender and was kind enough to create short video tutorials demonstrating the techniques.
I've been looking for a way to create cartoon iris textures in Blender, these are my results so far. The whole process takes about five minutes to set up, from then on you can create numerous combinations of colours in seconds.
I also have another method using static particles that produces completely different results...It's a very versatile technique so the video explains the basics of setting up the scene to keep the file size down. Please feel free to post your renders or settings that you find with the community so we can all learn from it.
I had some time to check out the first technique and found it to be a very fast way to create some pretty interesting looking iris textures! These are my results after just about 10 minutes with a little bit of post work done in Blender's nodes.