Windows 7: How do I change text cursor color?

How do I change the text cursor color? Not the mouse cursor. I mean the blinking vertical line that appears in every textbox.

A few mac themes make the textbox outlines nice blue. I cant remember which one did it for me, but you may search at deviantart. (http://www.deviantart.com/)

Have you been able to change the color?

Change the color of which thing ?

No I've not been able to change the color of the text cursor yet.

For most controls (edit fileds, dropdowns, etc) the caret doesn't have a "color". It inverts the color of the pixels behind it - white becomes black, blue becomes yellow, etc. Check out the second paragraph here: About Carets (Windows)

Technically it is possible for a control to choose a custom color or shape, but I have not seen any that do it. Most controls simply set the width and height of the blinking rectangle.