Fountains are the best-known example of a manmade object that compliments your primarily natural landscaping. A small pump submerged in water circulates that water and sends it rolling over the fountain, creating the soothing, gurgling sound loved by landscapers across the country.
Depending on what type of fountain you purchase, you could spend anywhere from twenty dollars to several thousand dollars. Simple fountains have only a small pump and stationary object over which the water flows. Extravagant fountains work with much larger quantities of water and may contain elaborate statuaries (think of Rome's Trevi Fountain).
For landscaping purposes, however, you'll probably only want a small fountain, which will include both the pump and the fountain. In addition, you should obtain a small pond liner (essentially a thick tarp) and rocks and plants to surround the fountain.
First, you'll need to excavate a hole for the pond, which will serve as your fountain's water source, and insert the liner into the hole. Follow the instructions included with your fountain, but in many cases, this pond is no more than three feet in diameter and two feet in depth. Then, fill the liner with water, and submerge the pump in the water. The pump should be able to displace at least 1/2 of the water each hour. Finally, connect the pump to the fountain using the included (and perhaps even preattached) tubing and turn on the fountain. Wait a moment, and you should see water flowing out of the fountain.
At this point, you can use your fountain as the focal point of your landscaping. Consider surrounding the pond and fountain with large rocks, and then planting flowering plants around the structure. You'll be amazed at the ways in which the water fountain compliments the rest of your landscape.