The crafts were quiet, fast, hovering and illuminated by several lights lining them.My wife, our neighbour and his wife were all sitting out in the field enjoying a bonfire (we live on a dairy farm). Airplanes pass over frequently, so at first we ignored the dull humming coming from the distace. After about 15 minutes we realized that the humming was still quite audible, now slightly louder than before. We started talking about it, trying to find the source, when out from the trees at the edge of the field hovered some type of craft about the size of an olympic size swimming pool, but triangular in shape, followed by an identical but smaller craft. They hovered only about 80-100 feet off the ground, though the sound emitted was quieter than that of a household vaccuum cleaner, and no wind or anything accompanied the low flying vehicals. They were lined with several lights, varying in size and coulour, some of which blinked liked a strobe light. After several minutes, the two vehicals were accompanied by yet another craft, the size of the smaller one mentioned before and identical to the other two. The material of the crafts was a metallic looking navy blue which faded into a green as it reached the two end points of the vehicals. They continued to hover for quite some time, never getting any louder, and they were only intimidating in their size. Finally, we heard a commercial plane nearing, and the craft flew straight up in the air, and then took off north/east in direction so fast we barely had time to blink before it was out of site.