Originally posted by wizard_of_woz:

Personally I am looking for a seed with very large Plains island. They don't seem to exist. I found one that is decent but not just like I am imagining.

Depends what you mean by large and island. The seed posted has a large section of plains that has a small part of forest and the landmass is off by itself (north part of that map).

Why do you want a large plains island?