As ShadeDBZ said, disabling layers is invaluable to the screenshotting ripper. Just about anything in a game can be isolated and easily ripped with this feature, and long as you can get it to come into the screen.
For example, if you wanted to rip a tree, just make your character walk until you can see the entire tree, disable all layers except the one the tree is on, then screenshot and remove the background using something like GIMP's colour select feature. If the object is larger than the screen, you can take multiple screenshots and paste them together.
I'm also interested in what you want to rip. Anything you would want to get should be viewable in the game, and as such rippable with the screenshotting method.
For example, if you wanted to rip a tree, just make your character walk until you can see the entire tree, disable all layers except the one the tree is on, then screenshot and remove the background using something like GIMP's colour select feature. If the object is larger than the screen, you can take multiple screenshots and paste them together.
I'm also interested in what you want to rip. Anything you would want to get should be viewable in the game, and as such rippable with the screenshotting method.