Have you noticed anyone around you doing particularly great work? Don't just sit there and silently observe - tell them!
Send them an email. Without expectations of anything in return. Be specific. Cc their manager too while you're at it.
So much great work's being created around us, but passes by with zero recognition or acknowledgement. Everyone's too busy with their own shit apparently.
This digital pat-on-the-back not only makes the person feel great about themselves (which they should), but also encourages them to continue creating great work.