I'm basically on the side of thinking it's pretty. I do kind of get not wanting to ruin a doily, but as others have said, you could use the paper doilies and try this.
The other thing for me - and don't jump down my throat - I really do love and appreciate doilies, but what can you really do with them anyway besides lay them on something and lay something on top of them. I think something like this puts them to a much better use than hoarding them up and keeping them packed away. Of course I would probably have a different opinion if I had actually made one.