It's time once again for me to acknowledge creative CD cover design when I see it. While the anime OP cover is extremely basic (outdoor shot, six heroines), the EDs are doing something fairly clever.
Haruka ED - look in the upper-middle. You can see Kaoru sitting there, back turned, just wandering into the shot.
Kaoru ED - Zoom in, rotate camera a few degrees, she now comes to prominence. The trend continues, as you can see something vaguely Sae-shaped in the window in the upper-right.
I shall resume this feature once I get more CD covers.