You can change the shape of your window to a circle! It's really neat and only takes three lines of code:
1 2 3
HRGN hrgn; hrgn = CreateEllipticRgn(0, 0, 200, 200); SetWindowRgn(Window, hrgn, TRUE);
It seems it doesn't actually change the shape of your window but only the viewing area of it? Very weird. Does anyone else have some cool win32 "secrets"?