You'll probaby neeed a GUI to draw the rectangle and put the phrases in aspecial font inside them. So your best bet is probably Windows GDI - the old and simple Windows graphical interface. Learning to write a Windows program is quite complex, but so is any other GUI interface.
That's a frightening thought for me because I adore a Unix coomand-line. Seriously, I do prefer a command-line and I've never tried to design a GUI. So I suspect writing a Microsoft GUI will be the hardest part of my conceptually easy project.

In college, I needed to write a simple text editor where the computer stored text lines in a doubly linked list. That program was fairly easy to write. Tokenizing a line is simple, too, but the GUI intimidates me a little.