How to get complex reflection coefficients?

If I terminate a line with an open circuit, I'll get reflections of any incoming signals with the same phase (a reflection coefficient of 1). If I terminate the line with a short circuit, I'll get reflections of any incoming signals with opposite phase (a reflection coefficient of -1).

What can I terminate the line with to get reflections with different phases, i.e. complex reflection coefficients with magnitude 1?

$$\Gamma = \frac{Z_L - Z_0}{Z_L + Z_0}$$
$Z_0$ is char. impedance i.e. 50 Ohm. $Z_L$ is complex if you use inductor or capacitor; thus $\Gamma$ is complex.