A part of career-readiness, problem-solving is an essential skill employers look for; this research paper presents some interesting statistics on the need for problem-solving skills as well as strategies for developing them.
This is a PowerPoint that explains lateral thinking strategies and the Six Thinking Hats. It could use some reformatting, but the best part is the riddles at the beginning. Consider giving these to the students and see if they could use the hats to solve them in small groups. They love to play detective!