How to use multiple particle types in a particle system? I created a particle system, duplicating a red sphere. However I want to also have yellow and orange spheres (already have them in another layer) in the same particle system. So I want to know how to use this particle system that I've created to show all three kinds of geometry/objects.
You will first need to select the objects you want to use, and press Ctrl+G to create a group.

Then use the Groups setting under Particle Systems > Render.



First, select the Group render type:



Then select the group you want to use: