Mocha as discussed in this Thread has been changing colors. I strated noticing about 2-3 weeks ago, and now it has just gotton so noticeable. I gave her a bath today, just to make sure she wasnt a dirty cat, but no, she is definitely changing colors!! Here are a few pics, so you can see.
Before:


in this one you could just start to notice the dark coming in on her side towards her tummy


during her bath.








the kitty of a different color!!