I've seen some NASTY public bathrooms in my lifetime, so personally I think this is a bad idea.
An attempt by officials in Paris to tackle public urination by installing open-air urinals, or “uritrottoirs,” has outraged some residents of the French capital. The new urinals, housed in flower boxes, aren’t subtle — they’re fully exposed on street corners, painted bright red, and have nearby signs advertising their presence.
The problem is that a lot of men don't keep their... ahem... stream under control. There's gonna be pee all over these boxes, all over the sidewalk, all over the place.