eye pillows
I actually decided to have a little fun when I purchased my eye pillow. I bought an Herbal Animal. They are eye pillows that look like animals, and you have 18 choices. At first, I wondered if it would be too playful for my office (not professional enough). My clients love it, though. They always smile when they see it. I guess we all have an inner child. The eye pillow covers are especially fun, because they are little nightshirts for the animals.
As for heating/cooling, I don't think the herbs influence that one way or the other. I believe it's just a personal preference. I don't heat my pillow. My clients find the weight of the pillow (and the darkness it provides) soothing by itself.
Here's where I bought mine:
http://www.purcifuls-toys.com/heranpileyep.html