Replicators

I have never been a fan of stock image photographers making pre-fab slide compositions, but in one area they can add value: digitally replicating items to infinity. See the attached image by higyou on Shutterstock. It is worthwhile visiting multiple stock image sites for these type of renderings, since they often can only be found exclusively on one site. Have a look at Filter Forge if you want to try to create these types of effects.