Are you an
I remember king Arthur well, back when I was young,
not sure about this one. I did find some reference to a Walter Crane that illustrated a version of King Arthur's tales, but that doesn't really fit the rest of my theory.
when I landed on the rising sun.
I believe this is referring to Japan
Back when I was flat and dull,
paper is normally flat and dull
I folded to the pressure, and grew my wings.
but after you fold it a few times (using pressure), you can create some wings.
Now I'm very skilled and artistic.
Origami is considered an art form
1000 is a legend, it's like a dream come true.
There is a legend that a survivor of Hiroshima (or Nagasaki) tried to make 1000 origami cranes before she died, but passed away before she could complete them. The goal was to fulfill a dream of world peace, because the crane is auspicious. Fellow survivors supposedly finished the cranes after she passed and buried her with all 1,000 in order to fulfill the dream.