You can go to browse rooms and select the room you're interested in, such as kitchen. Then you have to hope that the keywords you select were entered by the photo's owner. If you put + in front of each word, it means that the word must be in the photo description, keywords etc... For example: +white +shaker +hardwood +dark gives 399 kitchens:
http://www.houzz.com/photos/kitchen/%2Bwhite-%2Bshaker-%2Bhardwood-%2Bdark-
Your best bet is that if you found a photo you like, throw it into an ideabook - hindsight is of course 20-20.
Good luck, :) Rhoda