istockphotos.com are pretty good - I use them all the time. You have to buy credits in bulk, but if you're going to use them a lot it's worth it. There smallest images work out about at a dollar or two, and are of a good enough quality you can use them on your hub.
U.S. governmnet photos are also in the public domain, so you can go to the photo section on sites liek NASA, US Army, DOD, etc., and use the photos there . . they do request that you credit the government body and, if given, the photographer's name. Here is the DOD for example: http://www.defense.gov/multimedia/
Create your own. I guess it depends on what you consider a quality image. If you consider it an image in focus and not grainy there are many options. I use flamingtext.com to create a logo/banner. They have many options. Some you can control the banner size. Others you can not. Download them in your Paint program and resize them to suit. Use your main keyword phrase. Also use it in the title, alt text, and description.
For photographs zoom into desired screen shot and hit <print screen> key. Open Paint program and hit <Ctrl-V> keys. Clip desired image.
Modify the image to avoid copyright issues. Clip out section of a larger image. Add borders. Add image to another image for the background.
See my new Hub Page "How to Make Images to Improve Search Engine Rankings"
I use my own photos and just ask for permission to use other people's photos when I need them.
For example with my latest hub I requested permission from the owner of the sites I mentioned to use their images. They all agreed no problem provided that I give them credit for the image. I think that is a good deal.
I just make them myself with a simple program called "StoneSet Capture" which I posted a tutorial for beginners on. I gave a link to the older free version, and made all the images for the tutorial for that program. The more advanced and newer version also lets you easily make videos of whatever you are trying to illustrate on your desktop, which you can upload to YouTube. Using YouTube seems to be the trend these days.
Also, many websites will let you use their images free if you are promoting their products. By promoting their products (provided they are EXCELLENT products) with tutorials and reviews, you have something great to write about as well as a cross-source of traffic. But I only do this if I REALLY believe in the product. People won't read your articles if they sense you just want to sell them something.
I simply get most of my images from google search. Just look in google images while searching. You will find some high quality images there. Also you want to choose images that are large in size. Do not use small images because they will become blurry when you insert them into your hubs unless you are planning to keep them in the small size.
I try to use mostly my own images. Unless I am writing a hub about a certain musician or movie. I get most of those off from public fan sites like yahoo groups, but, you can almost get those types of photos anywhere, just by doing a search.
My favorite place to get videos is Youtube. The amount of videos at the site is staggering. You can find any video about anything there. I was on the site last night looking at all the crazy carnival rides in Europe. Man they have some good ones, and it is crazy how people seem to be walking onto these rides while they are moving! Or so close thay can reach out and touch a very fast moving ride. Which would never happen in the U.S. Too dangerous.
There is a ride called the trabant here in the U.S. and I saw a video of one of those rides with people riding it standing up! With no kind of safety restraint at all! never happen here.
I try to use my own photos as much as possible. If I'm doing a food hub, I will take a picture of the food myself. I also have many photographer friends who let me borrow their work, but I always always give them the photo credit!
I truly appreciate this question. At times, it's difficult to find a photo to compliment your hub. Aside from using my own pics, I have found photos on wikimedia commons, and freedigitalphotos.net. AND a fellow hubber, World-Traveler offers his photos for free.
Thanks everyone for all of the GREAT recommendations and suggestions...except for the person who threw shade and left a snappy comment...shame, shame.
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