Read more at Beyond Phototips:

1) Keep your mind open
There’s nothing on this planet that can ‘not inspire’. If you look at a piece of trash and say “How could I possibly be inspired by this?” you’re not looking beyond the obvious. Think about shapes, colors, reflections, juxtapositions, bigger social context, etc…

2) Practice
Practice helps you reach perfection, right? Photographers who take pictures daily are more likely to “see” an interesting picture where others may miss it.

3) Pay attention to the light
Light is all around you, but actually looking for interesting light will help you understand it better. Look at the textures, effects, patterns and paths that it creates, look for color casts, reflections, flare, and sparkles as it reflects off various surfaces.

4) Understand your subject.
They’re always a better source of inspiration and creativity than most other things when it comes down to shooting creatively. Think about it… what could inspire you more about a subject than the subject itself? You need to be sympathetic/enthusiastic about it though! If you are, you’ll automatically think of possible tangents, related fields of interest.

5) Look at other photographers’ work
Look at it, and try to figure out what’s important to their photography. Look at it upside down, left to right and inside out… How do you know what is important to them? Usually it shows in their style of photography, choice of subjects, treatment of the subject and a whole lot more.
6) Let other art inspire you**
Other arts can influence our subconscious thinking, and they surely can influence our conscious thought processes. Use that influential power… soak up all of the art that you love, and let it empower your photography.

7) Let your mind wander
Give yourself time, and space to think outside the box. Think about anything/nothing/everything. It relieves you of all ‘requirements’ and lets you go on a flight of fantasy, where the only limits are what you cant imagine.
8) Know your equipment**
Use it until you know every groove in the handgrip, every speck of dust that you’ve removed from the viewfinder, every dash in the text of your LCD.