Everybody knows this, right?
Do not use the "Cloud" objects in the Archicad library. They are the worst objects in the world. Update: I killed these with my bare hands. They're gone and you needn't fear them any more.
Clouds should be drawn with a closed spline using the "cloud" linetype. The only glitch is that sometimes the cloud will be inside out when you are done. If this happens mirror the cloud, or, if the shape is non-mirror-friendly, draw the spline again, in the opposite direction. Sometimes the spline doesn't quite close. Pretend not to notice.
For the triangle, use the object Character+Shape JAM8 Shape Tag JM9. The number comes from the ID.
Bad cloud. Looks like a chunk of foam rubber from an AirTran pillow. Also missing marker.
Pretty cloud, reminds one of heaven.