change cursor at runtime, draw cursor with bitmap

Creating a Color Cursor from a Bitmap:

http://www.codeguru.com/Cpp/W-P/win32/cursors/article.php/c4529

CreateIconIndirect Function

.NET:

Cursor.Draw method: Allow user draw in the cursor's rectangle.

Change the cursor when drag-and drop:

DragEventArgs.Effect

GiveFeedbackEventArgs.UseDefaultCursors