That’s right: if writer’s can have a “block,” so can photographers. For me, it’s a dry time in my inspiration that can come either from being tired or from lack of compelling subject matter. Some of the ways I get past it are:

1. Take a trip. Get out of your usual environments. It’s good to return to a scene over and over again to see what else you can find in it, but you may also find eventually it turns into a dry tourniquet. A new city or location you haven’t previously explored may give you some new opportunities for your inspiration to catch fire and some new photos to emerge.
2. Take time off. Yup, it’s okay to not take pictures for a while and do something completely different. Life and photography aren’t synonyms. There’s more out there to do, and who knows if that something else will spark inspiration again?
3. Instead of taking photos, read a good book on photography, best in an area where you aren’t strongest. After you’ve read a while, go out and put some of what you’ve learned into practice.
4. Instead of taking photos, go through your old photos and re-process them. Maybe try a favorite color photo in B&W this time. Try out some new post-processing techniques. Analyze your photos for how you can improve them in the field. Next thing you know, you’ll be out there again looking for the next great shot.
5. Change equipment. Often this is thought to be a fool’s errand if it means investing in new equipment, but I’ve found that mixing it up (say going from long lenses to wide ones, or viceversa), or even (yes!!!) buying a new body renews my interest in photography and by virtue of wishing to put my investment to good use, I get out more, excited again by the hunt for new photos.
6. Change approach. If you usually go out in the golden hours, try shooting in midday in that horrible harsh light. Learn to shoot with flash to improve that “bad light” or make up for lack of any light (instead of insisting on high ISO). If you take photos really quick, force yourself to slow down and think more about it. If you are the methodical, set up the tripod, measure the light and take the photo 3 hours later, shoot fast and learn to recognize patterns and compositions quicker.
7. Change subject matter. If you’ve been shooting a lot of landscapes and all rocks and trees are beginning to look the same, maybe it’s time to shoot portraits, or rock concerts, or weddings, or (gasp!) birthday parties, or even go out and shoot some street photography.

For those suggestions that involve changing something, you may find out that even when you go back to the old and comfortable, you are better for it, you see more, capture better, and in all, end up with more keepers.

Anyway, that’s my approach, and you may want to try it and see.