It's actually called the Wisteria Tunnel, (it's not even lavender) and it is at the Kawachi Fuji Gardens in Kitakyushu, Japan. Here's its Neopets counterpart:
It's kind of sad, though, because lavender isn't even a trailing flower (it grows in little bushes) so I don't know why they would name this a lavender trellis.
Anyway, do you know of any other Neopets backgrounds/items that have real world inspirations like this? I don't mean like, pencils and ice cream. That's obvious. It would be neat to see some more awesome examples