Ok, so I guess I'll just wait for Spring to see what happens. Hopefully they'll look as great as Scottychaos' VFT's. =)
Vraev: Yes digestion is less efficient during dormancy. In fact, the traps may stop closing all thogether after dormancy has started and lasted for a few weeks.
Consider this: In there natural environment, VFT's go dormant in late fall and through the winter (duh!). Insects also die and some (I believe) hibernate too. So, VFT's don't get to a chance to eat during the cold months, becasue there is nothing for them to eat. If your plants are starting to go into dormancy, then their digestion is going to slow down. So you may want to cease feeding them until the spring. Also, like Alexis metioned your traps turning black may just be because they are old. I remeber when I fed my biggest traps house flies: they would turn black and die too. Just becasue winter dormancy has begun doesn't mean that the all the traps and leaves will blacken and die, I have read that some make it throught the winter without any problems.
Remember: Feeding your VFT should only been done seldomly when being grown in a terrarium to avoid loss of traps. You can feed them as much as you want, but IMO it's too risky. =)