This was a phenomenal year of Shooting Challenges. Your submissions were as beautiful as they were plentiful. Check out some of the best user-submitted images of 2010.

1. 30 Impossible Scenes That Actually Happened
The photos that follow are impossible. But they actually happened. The entries for this week's Shooting Challenge are composites, stacking subjects from the same place at different moments in time. The results will bend your brain in the best ways.

2. 183 Heavenly HDR Wallpapers
There's no going wrong with HDR photography. At its most sensitive, the technique allows for color/tone gradients rarely appreciated by anything but the naked eye. At its most aggressive, HDR's a hyperreal spectacle. This week's Shooting Challenge celebrates both schools.

3. 30 Shamelessly Stolen Photographs
Some might call it plagiarism, but the knock-off is an art form all its own. For this week's Shooting Challenge, Gizmodo's readers assembled to duplicate or parody some of the most iconic photographs in history. (Light NSFW content follows.)

4. 101 Photos Taken With the Lens Detached
Take your DSLR in one hand. Unscrew the lens with the other. Tilt the lens away from the camera body-maybe even flip the optics backwards. And take photos that you never imagined you could without expensive upgrades.

5. 45 Photos From Clever, Sometimes Unbelievable Perspectives
This is the view from the last drops of your water bottle. And here are 44 more brilliantly conceptualized photos from this week's Shooting Challenge.

6. 264 Stupendous Spring Wallpapers
In this week's Shooting Challenge, 264 photos submitted by our readers capture everything wonderful about spring. Take your time to check them all out-it's a real treat. This is the absolute best group of entries yet.

7. 77 Sensationally Staged Scenes
Some pictures capture a moment. Others capture a story. For this week's Shooting Challenge, I asked you to stage a scene. Your results were sometimes funny, sometimes beautiful, sometimes sad and always worthwhile.

8. 116 Incredible Wallpapers By You
For this week's Shooting Challenge, I asked you to shoot whatever you wanted. As the 116 photos that follow prove, this was a great decision.

9. 59 Fiercely Focus Stacked Photos
For 100+ years, any given photo had a single prime focal point. But the results of this week's Shooting Challenge combine multiple points of focus to create images never seen before.

10. 171 Absolutely Abstract Wallpapers
What is abstract photography? We could debate the nuances of the definition all day-as many do. But it's so much more fun just to look at the mind-bending pictures from this week's Shooting Challenge, isn't it?

Been under a rock? See what else happened this year in our Best of 2010 series.