When you are in a crunch for subjects, look in your own backyard, kitchen garden, or nearby plants, you ll find the tiny insects there busy at work. And as long as you dont disturb them, they wont mind giving you a few shots.
This post, should also show that why a macro lens, though serving the purpose, is a very good option. The photos here are taken using the 55-200 mm lens with a +4 Macro lens filter. The DOF is vastly reduced, thats fine, but clarity is absolutely missing, that is not too fine. The photos here may appear to be just fine, but they are grainy, and I would love to have a macro lens and shoot with it, rather than the filters.
In a desperate pinch, these get the work done, just though.