Here are a few simple tips on how to get novel ideas:
-Sleep a lot. You can only dream when you're asleep
-Go outside and experience the world. You'll probably get hit with something sooner or later
-If you're lazy, then just daydream. You've got nothing else to do
-Talk to a lot of people (or animals, or maybe even inanimate objects)
-Listen to a lot of music or watch a lot of movies
-Try doing some of those writing prompts
-Go on Google Images and just look at a bunch of random pictures
-Remember the words, "What if..."
-Go people watching
Well that's it. Hope you'll think of a great idea for a novel!