After I create a new frame by typing

M-x 5 2

in Emacs, my cursor color is black. But the color of my original frame is LimeGreen or lime green.

I found this site:
http://www.dansanderson.com/blog/mt/mt-search.fcgi?tag=NewbieEmacsTip&blog_id=1&IncludeBlogs=1

and added this line:

(add-to-list 'default-frame-alist '(cursor-color . "lime green")

to my ~/.emacs file