Walking past a small gallery off Oxford Street I noticed in the window two works (prints) by Bob Dylan, There were a few more inside (plus some nice Stan Lee comic artwork). The Bob Dylan prints ar part of a series called Drawn Blank (See here). This one would be good on the slow train coming album.
Bonhoeffer uses a similar phrase 'worldly Christianity'. It's J Gresham Machen that I want to line up most closely with. See his Christianity and culture here. Having done commentaries on Proverbs (Heavenly Wisdom) and Song of Songs (Heavenly Love), a matching title for Ecclesiastes would be Heavenly Worldliness. For my stance on worldliness, see 3 posts here.