I have a large water color, mostly blue and black. It's a wolf with cattle skulls baying at the moon and a tall palm tree. Is this worth something?

It's worth whatever someone might want to pay for it. I do notice that quite a few of his paintings come up in image searches in Google. Geoffrey Holt watercolor painting - Google Image Search (http://images.google.com/images?hl=en&safe=off&q=+Geoffrey+Holt+watercolor+painting&um=1&ie=UTF-8&sa=N&tab=wi) If you click on that and then subsequent links that you will find, I bet that you will find some prices listed for his works that might give you an approximate idea of what yours might possibly be worth in terms of monetary value.

I also notice that there are some selling on eBay. Geoffrey Holt Painting eBay - Google Search (http://www.google.com/search?hl=en&safe=off&q=+Geoffrey+Holt+Painting+eBay)