[Mountain_Skies]

I've seen some in Vancouver that are little more than an oversize planter with a scrub in it stuck in the middle of the intersection. As long as it deflects traffic to the side a bit, a slowdown is achieved and the main purpose fulfilled.

[fassssst]

Yea there are a bunch of those in Seattle neighborhoods, they work well.

[kn0where]

In my experience with the ones in Seattle, people who are turning left use the wrong side of the mini roundabout to save 3 seconds of driving time.