I established a random pairing concept at our company (~15 people). It goes like this: Every week a little script takes all names, produces random pairings of co-workers and posts them to slack. The goal is that everybody should communicate with everybody else on a regular basis, even if they're not working on the same things. The time investment is 1/person/week right now. The response so far is very positive. People learn a lot and enjoy it.