The Secret Belgian Binding (originally named Crisscross by its creator, Anne Goy), is a versatile structure that begs to be experimented with. You can change the colors of the threads in the weaving pattern, paint the covers, collage them, cover them with bookcloth. I photocopied a copy I had of the Why Cheap Art? manifesto from Bread and Puppet Theater and used it as my covering material, both over the main boards and over board scraps. I sealed it with acrylic gloss varnish. My post on Secret Belgian Binding is here. Instructions are featured on pages 159-161 in Making Handmade Books: 100+ Bindings, Structures & Forms.