Knowing where to start is the hardest part of any project. In the design thinking process, you spend a lot of time learning to empathize with your users through research, then properly defining the problem that your project needs to help them with. At some point, though, you have to pivot your brain to put all this understanding and definition to use. Luckily, there are ideation techniques that you can employ to add guidance and structure to your efforts, sparking creativity and innovation.
One of the obstacles to good ideation is that people often practice it in a haphazard or chaotic way. Everyone today likes to talk about the value of brainstorming, but they often think of it as unstructured imagination that magically and randomly produces ideas. Effective ideation requires that you stop thinking in terms of these amorphous activities and instead apply a rigorous and purposeful set of rules to your efforts. One technique to help guide you in brainstorming is mash-up ideation.