There was a
well opinionated debate that started on Flickr in the Nikon Digital group about the uses of borders in digital images. Contenders from both sides argued the pros of cons of using borders, with, strangely enough, arguments for both sides peculiarly alike. "It looks cheesy without it" "it adds/detracts from the image". Eventually the subject died and everyone agreed to disagree.
Then in this world there are those who I believe sole purpose in life is to resurrect dead threads. I mean, this topic was 7 months old from my last comment, and here it was again, back in the limelight with both sides waging the same bitter comments. I of course not able to resist a good debate had to once again pitch my 2 cents in.
Really, when it comes down to it, it's subjective as the photograph itself. Some people like it, some hate it. Personally I'm middle ground. I find that sometimes, a good clean border can help an image stand out a little more, especially when displayed on Flickr's white backgrounds. However, I do believe an image should be able to stand on it's own without one. I've seen some absolutely
hideous framing jobs where the image is 1/4th frame and you wonder whether you're looking at a picture or a giant black frame. But I have also seen framing doing very
cleverly. The type that makes you want to go out and try similar techniques. You know, the kind that
inspires.
So here are the rules I follow when deciding whether to use a border on my photos:
Is the image strong enough to stand on it's own? Quite simply, if I didn't put a frame on it, would it still be a strong image? The border should be the cherry on top. It should compliment and enhance an already wonderful piece of work. This is subjective of course, so use your best judgment.
Is there a lot of negative space where the eye can wander? Sometimes images that contain negative space as a purposeful feature (and not just center focusing and leaving large gaping areas open) can lead to the eye wandering off a bit when viewing the photo. A slim border can help to contain the eye and keep interest on what's important in the image.
Keep your border to no more than 10% of the image size Huge borders are just ugly. It shows an individual is uncertain of his talent, and hopes to hide within the safety of a large border. Borders should be presentable, maintain the theme of the image (a grunge image could have dirty border, but may not work for child photography) and lastly, minimalist. Remember, it's the cherry on top, or the garnishing if you well. Just a little something extra to sweeten the deal. Less is definitely more here.
Be Creative Mix it up. Sometimes a simple plain black border works, and sometimes you can try more interesting ways to frame your works. I've experimented with quite a few styles, but have finally decided I'd rather not use them. It's an opinion and you're welcome to your own.
Examples:
A small thin border designed to separate from Flickr's white background. Also there is a small copyright logo in the bottom.

A bit creative as I used the image itself to create the border by cutting out a small piece, and darking the edges around it.

Small, thin and neat and designed to help contain the eye within the image.