Ideas are everywhere, except when you need one. When I started writing romantic suspense, I found that I was not nearly so observant as I prided myself on being. Now that I am writing full time, I sometimes find that I have to force myself to slow down and appreciate the little things.
In romantic fiction, the tension is in the details. Lots and lots of details. If you find that you are having trouble coming up with ideas for plots, characters, or settings that can make your book stand out from the crowd, try some of the following.
Gleaning from personal experience is not always feasible, but occasionally we writers do need to put some actual clothes on and leave the house. Go do something you have never done. Go go kart racing, go fishing, go to a play. Anything you have never experienced before can get the ideas flowing.
Keep a journal. This is something that we often take for granted. We assume when we have a good idea that we will file it away and remember it when we need it. Then, as is always the case, life happens and clutters up our head and buries our idea. Write it down!
Go for a drive. I have some of my best ideas when I am driving. Keep a notebook handy on those scenic drives and pull over occasionally to take in the scenery and write them down.
Music. Making playlists for certain moods can really help you get in the head space you need to be in to get those words down. Sometimes, just organizing the songs can kick your creative brain into high gear.