Backstory: Teams need motivation to move forward. Whether it's spoken or written some people just need to hear it regularly.
The Idea: A service that sends motivational quotes.
Deep Dive: You would build a simple interface for people to select motivational memes/images to send to their friends/employees. As it gains traction, you could build more advanced features like categories and eventually build an algorithm to send similar quotes to those liked by the recipient.
Validation: There are tons of motivational instagram profiles with 1M+ followers.
Monetization: You would have to resort to ads for this platform. You could also adopt the freemium model where the quotes/images are branded with your company and people can pay to remove it.