As it turns out, I did make such a 'coffee table' book of all my favourite photography back in the spring. At that time, I chose to use this image on the cover:
However, since then I have taken a lot of new photos and created a lot of new photo art. I love last week's image of the gorilla's hand:
The other one that I might use is this one of the monarch chrysalis just before the butterfly emerges. In the summer I put a couple of monarch caterpillars in a terrarium and photographed the metamorphosis from caterpillar to butterfly (you can see it here). I used one of those images to create this:
So, it's a toss up between these two right now, but since I won't be creating another photo book for a while, there will be so many more to choose from when the time comes...