The short answer that I use for ideas is I take notes of store and store dispays whenever I go out. Since I don't have a good digi-cam....If I'm out with a friend, he has a great picture phone.....I get him to snap off a picture or two. Or I sketch a quick diagram. I also regular peruse magazines, old design books, catch some of the home and garden tv shows.......some of the decorating shows.....I even get ideas from watching some of the episodes of American Chopper...( and they focus on motorcycles ). Keep a digi-cam, or a notebook with you at ALL Times.......whenever an idea hits, or you see something neat.....snap it, draw it, sketch it, note it, jot it down.
I actually had a boyfriend break up with me on that account. We would go to the malls, different stores, and I would always have my sketch notebook.....An idea or a display would hit me and I'd stop and sketch it out, or write about it, or note, it or something. He would get so aggravated...He asked me, begged, me, pleaded with me to "turn off the creativity"..."turn off the idea grabbing". I told him that I can't. It can't be turned off. It was a Christmas season quite a few years ago......one of the stores in the mall had done a fantastic display with hollowed out silver balls......and I could see various designs perched in and spilling out of a similar display. I went in and talked to the manager......turned out, the store was going to dis-assemble the display the next day and I could get those big hollowed out spheres. He got so amazed that I had the nerves to do something like that that he said he had had enough. He broke up with me a day or two after that. I still used those spheres and did a gorgeous display.