Good idea, I just finished my project for proper bathroom sound last weekend: An old phone and my old TV soundbar (from Canton no less). Furniture feet from Amazon (20 eur). Grille built from a few wooden sticks (5 eur) from the home improvement store, acoustic fabric (25 eur) from www.akustikstoff.com tacked to it. Grille bolts from eBay (6 eur).
Quite proud. I still have to make the cables pretty.