If you have a contact that you have placed a picture, and call it, you have their picture on the dialer.
If you use the voice command to call the same contact, then select to call (contact) on (whatever), the same dialer screen comes up, but no picture is loaded.
Must just be a minor bug.
At the same time I was going to say I wish I could change the colors, but if on BT you get the dialer in blue, nice. Havent tested with BT dialing, as we don't have BT commands yet for it.