I was recently reading one of my favorite design newslettersThe Grit and Polishby Cathy and Garrett, an old-home-renovating duo in Washington State. Cathy was sharing about shopping for window treatmentsspecifically the designer-beloved Chik blindsfor a rental renovation project. When the estimated price for the blinds didnt come in at budget, instead of giving up, Cathy employed what shes coined, The 90% Rule.