I would like to thank an anonymous commenter from a few posts back for offering this idea. I have tried it and it is a terrific addition, or change rather, to the shanghai practice game I use. Here is a pic first, then I will describe:
First, follow the link above to read anon's comment because it is a good description of the Bowtie. But notice in my pic above I am not going for the doubles. I happened to be doing a round of triples at the time and was taking a break from it with a little shanghai (I will do that sometimes if I am missing the trips badly). Well, normally in shanghai, if your first dart hits the bull then you cannot make a shanghai so you just do a round of bulls practice. In the bowtie situation you go for opposite segments. In the pic above you can see I hit the bull first dart, and then the second dart was aimed at the trip 6. I missed low into the trip 10. So the third dart went for the trip 14 and I hit it. Thus forming a bow tie.
Here you can see the only actual shanghai I achieved in that practice round. These are not the normal darts I use though: