I really like ceiling fans (big fan!) and we have them in most of the rooms of our house. About a year ago we also built loft beds for the older two kids bedrooms:

Which offers a potential conflict: you don't want people and spinning blades to occupy the same place. While in that picture they look close together, they're not actually that close: when climbing up and down normally there's a good bit of room between you and the fan. But if you turn around while on the ladder and start playing, you can get into the path of the fan.

While our kids are used to this, they also have friends over. We tried having a rule that the fan needs to stay off when friends are over, but it didn't work very well: they'd forget or a friend would flip the switch. After one of Lily's friends got bonked (they're fine) we decided to make a guard for it:

The idea is, it's easy to see and avoid a bright colored piece of wood, much more so than an off-white spinning fan blade. And if you're on the right side of the wood then you're away from the fan.

Lily and I made it together: we measured the angle, cut one end on the miter saw, measured again, cut the other, sanded, painted, and put it up. When she got bored I did some of the steps while she played elsewhere. We did ~30% of the work together, which was ~60% of my time on it.

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[-]nim8mo30

Nice!

To go with the guard, would some blue painter's tape on the end of each fan blade help make it a bit more visible and obvious to visitors, without wrecking the look of the room?

Wouldn't tape disbalance the fan so that it breaks faster / starts to make sound after a few months? Not sure, but these problems seem plausible.

[-]nim8mo21

More tape on one blade than another might unbalance it... air resistance increase from the texture of blue tape could also be an issue.

Another way to increase contrast would be to change the ceiling color above the fan. This could be done with something temporary if one is careful that it can't fall into the fan, or painted.