I watch TV or a movie and usually an idea sparks from what I see (nothing that copies what I saw on TV though). Sleeping also helps 
. When I dream I get a lot of good ideas and even just closing your eyes and relaxing can spark creativity 
. Looking at artwork and listening to music helps 
. A picture’s worth 1000 words after all.
You can also try this:
Try not to pound your brain over it, let the ideas come to you 
.