Actually, since Wakefield is only making bottles available to OG members right now, I have plans (or at least kind of a joke idea that's been tossed around with a friend) to make one and call it PFDF, and then do a ****ty hand drawn label of a woman with a dragon.
Anyway, the key to getting the beer pink is to use red flesh dragonfruit. The white flesh stuff, obviously, won't give any color. It's not an easy fruit to come by, and I think it's pretty expensive.
As far as recipe goes, it's very difficult to imitate someone's berliner weisse process. Find a process/recipe that works for you. All I can tell you is that Wakefield's berliners are VERY sour and have a lot of fruit flavor. Dragonfruit doesn't have a very distinct flavor, so use enough to make the beer pink, and then load that **** up with passionfruit.