Nan, your monkeys are adorable! I admire your talent! I'm so glad you posted a picture!
The quilt pattern I was looking for uses four different colorings of the snail's trail block. When they are arranged properly in the quilt each monkey is formed by one each of the four possibilities. Each of those blocks also contributes to another monkey and some of the background. The tails are appliqued as well as the eyes, nose, mouth. The head and ears are further defined by the quilting. Three of the four colorings are:
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I am no expert on quilt blocks, either, but I believe a snail's trail can also be referred to as a monkey wrench. They are at the least very similar. Many blocks are known by several names.