Wow, great photos!
Are all the Ghosts as huge as the one in Steve's post?
There are two sizes, as far as I can tell. Steve can probably answer that question better than me. I believe the size Steve is holding is the larger 11 foot wide with 30 foot tails one. The blue one above is 7 foot wide with 20 foot tails. Standard colors are white, black, gold, blue, red, and purple. I've also seen some multi-colored ones and custom ghosts.
If you want ...here are some plans to make your own delta ghost:http://www.schmidts-pit.de/bauplaene/schleierdelta/Schleierdelta.pdf
I'll leave the translation into English for you.
Then there's the 7' wingspan 'Geometric Pyro Delta Kite' in three color combos like this one:
And ...the 9' wingspan 'Fish Pyro Delta Kite' in two color combos here: