The most recent modification I have noticed is the revolution of showers.  Showers are no longer the dark, hidden caves of previous decades.  They have become a major decorative feature in the bathroom.  Many homeowners are choosing to use two or three tiled walls with the additional wall(s) being glass.  This change is beneficial in many ways. Foremost, attractive decorative tiles and designs are showcased by the openness of the shower.  Secondly, it is more economical: it is more cost effective to purchase glass doors rather than framing and tiling additional walls.  The glass also creates a more luminous shower.   Finally, but sometimes most importantly to homeowners, it allows air to flow through the shower thus drying it quicker and reducing the opportunity for mold or mildew to grow.  
While the elegance of showers has blossomed, one question remains the same: how to maintain clean grout.  Diligence is required.  Your tile and grout should be sealed with an eco-friendly sealer after installation. This should not be the end of your relationship with grout! You should keep ahead in your cleaning and re-sealing.  Many green cleaners are now available (www.qualitymarblecare.com) which are effective.  A monthly cleaning is advised. I would also recommend resealing your tile and grout annually to ensure that your shower stays in top condition.