Talking about The Blind Watchmaker reminded me of one of the things that’s so fascinating in the book.
Dawkins had also written a Blind Watchmaker program (bearing in mind the publication date of the book, I have to wonder what language the program was written in - Pascal, even BASIC?). The program essentially allows artificial selection on what are called biomorphs.
Each biomorph has a small set of genes responsible for various attributes. Through artificial selection you can select for branchiness or straightness or any other attribute.
Anyway, I’ve found a biomorph breeder java applet. Fire it up and have some fun playing biomorph God.