If you go into the folder for boland c++, you can find a graffics demo there.. you can try to study it some and see if you figure it out. they change size, front, colors etc etc. as for the colour you asked for u can use:
there are more tho.. but you can find some in the FAQ.
textbackground(color); //Works after a clrscr();
textattr(color > color); //Works for cprintf(""); and sets the color of
that line, or command.
textcolor(color); //Works allso for cout. but you then set the
color for the rest of the program, and you need to clrscr(); after the
color is set.