• Change one element in an activity you do repeatedly. This will require you to learn something new and that will trigger the creative process.
• Add something new to a routine. For example, when watching your favorite TV drama, pause it every ten or so minutes, and predict what will happen when you resume watching.
• Engage in an activity that constantly changes. 
• Begin a new activity. The best example is learning a new language. Everything is fresh: the meaning of words, the syntax, and pronunciation.

The purpose of creative activities for brain health is not to produce a sellable or even a laudable product. These activities creates new neural connections that can preserve your cognitive ability or at least slow down its deterioration.

Also, just as muscle strength takes time to d...