"Whatever you do don’t go into Google Images, grab one and use it. You will be in breach of copyright and yes, they will find you, even down here at the bottom of the South Pacific.
A much safer way is to either pay for your images, create your own images, or use free Creative Commons’ licensed images. You can find many brilliant images (and layouts!) on Adobe Stock, or Envato’s Graphic River, Dreamstime and other online image sources." (thanks Freeparking)
For New Zealand images in particular, try NZ owned MyChillyBin, who have spectacular Kiwi images.
There are some good sites with great free images if your budget is not huge, and with the details for each image so you can attribute to the photographer.
Image from PikWizard, thanks.