Brandon Sanderson did this with his Mistborn series. The night was feared by many, buy the mists were a force of good and brought power, while the daylight brought vulnerability and in the end, immense, destructive heat.<<I like this idea quite a bit
The tips for how 'not' to do it, are a good idea tool too. Because for every way to commit a crime there is a way for it to be fludged. Or the 'I backed my way into a corner and how is my character going to solve this' kind of issue.