Simple
"Today is " + now().formatDate("dddd")
Advanced
"Mon Tue Wed Thu Fri Sat Sun" .replace( now().formatDate("ddd"), "[" + now().formatDate("ddd") + "]" )
Creative
now().formatDate("ddd") + ": You're " + (now().day() % 7 / 7 * 100).round().format() + "% through the week!*"