it just comes down to how badly you want/need the effect… if it’s really important, then it may be worth the time, if not, then maybe a more basic cube is fine.
if the cube and camera are static, then the reflections can become easier… but you still need to think what will be reflected… if the cube is outdoors, then find an outdoor shot, clouds, trees, whatever you think would be reflected… you can blur them and adjust contrast and blending modes in ae.
a place to start might be to just add a gradient overlay or ramp to the sides of the cube to simulate some glare. using the gradient overlay layer style will allow you to add several colors to the gradient, so you could add shades of colors for the floor color and a sky color.
Kevin Camp
Senior Designer
KCPQ, KMYQ & KRCW