Hmmm...I think Jondalar meant more in the sense of the music itself having a color signature, maybe even an aura. Is that right?
Do you have Synesthesia? And totally off-topic, but is your name from Clan Of The Cave Bear?
I do love it when an album cover is well-matched with the contents within. I think Bella Donna is perfect with this, with it's black-as-night cover and it's elegant, bluish, dream-like pictures of Stevie on both front and back.
I thought Wild Heart was less successful at this, and though I liked her look on the front cover (and her vamp-lesbian-bordello shots for the rest of the album), it didn't really match what was going on musically, with elements of country and synths everywhere.
Rock A Little, though, I thought was very good. The look was clean and a bit wintery and that seemed perfect for "Talk To Me," "Nightmare," "HAEWAFY" and many others.
I was not crazy about the next two albums NOR their covers...so, uh, perfect match.

The cover for Street Angel was particularly dismal (though I did like a few of the songs from that album).
Trouble in Shangri-La was back on form for me -- loved the splash of color and the warmth, which I thought the songs shared. I loved the stately hall she was running through as well.