Whenever something doesn't go the way it should, try something new, take the blame. Whether it happened to you or a coworker, it doesn't matter, take the blame.
A project didn't go as planned as work, maybe you could have helped, maybe you could have pitched in.
Someone didn't do something the way you would have done it, maybe you could have explained it better, maybe you could have told them your expectations more clearly.
Taking the blame is liberating because it puts you in a position where you can change things and fix the problem. If it's always someone else's fault then your unhappiness is dependant on others changing the way they do things. Good luck with that.
Take the blame and give yourself the gift of being able to improve your life.