When I was taking photography in college, the first term was all about different techniques. Each assignment was to try out a new technique. One week we did night photography, another freeze action. One week it was panning. One of the best assignments, though, was to produce an image using an unusual camera angle.
This is one way to produce striking images. You have probably seen beautiful images of tulips or poppies shot from the ground - under the flower, looking up toward the sky. You catch a bit of vivid blue sky. The flower is back-lit. Sometimes you have towering white clouds in the background. This is an example of what I mean.
An unusual angle simply means that you shoot from a different angle than that at which you would normally view the subject. Lie down on your back and shoot straight up into a forest. Get on eye level when shooting small animals, insects, etc. Get on top of a cliff and shoot down on a flock of birds. Working this way can often turn a mediocre image into a truly striking one.