For this example, well use a simple landscape of mountains, created quickly and easily by drawing a jagged, erratic line with the Pen Tool and then filling the area below with a gradient of two shades of brown, just for a little variety. The snow caps were painted in with the Brush Tool. It looks a little crude, but it serves its purpose.
This example only works if you make a symbol (F8) out of the object. You can do the same thing manually, but this way is quite a bit easier.