Well you could hire a photographer, but that is alot of time and expense.
You could get your designer to source an image, but many will add a massive markup to the fee for the image.
You could search from various sources of stock photography, but many of these sites do not have a great selection or variety of images to choose, many don't have an effective search tools or again, many are prohibitively expensive.
iStockphoto provides royalty-free stock photos, most only US$1 for a size suitable for the web. As you can see from the images above, considering the quality of images this is a great price! What is more iStockphoto features powerful search and filter functionality which allow the searcher to find relevant images quickly. Want to make sure your search only returns results with a person in it? No problem. Want a match a particular background colour? Also no problem.
As well as great photos, they also feature illustrations, flash files, and now video.
Yes, there are New Zealand-related images! Check out these searches ...