Did someone mention my name?
Personally once you know a couple of basic twists I advocate buying some balloons and a pump and just trying to work out your own models, trial, error and lots of practice will show you what works and what doesn't (maybe invest in some ear protectors if you are working in a small echoey room though)

Buy either Qualatex (my favourites) or Sempertex, get yourself a decent two way pump (MasterBlaster 2 for example) and just play!
That said I am reliably informed that the best DVD/Videos you can get are by the late great David "Twisty" Grist. I haven't seen them myself... but I have seen some of the models he made before his untimely death, suffice to say he was a master.
Alternatively any of the aforementioned books will probably be helpful, the Palloncini books have some top models in (I really must get hold of them some day).
Most stuff I do is either my own design or I see something someone else has made and work out my own version.
Hope that helps old bean...