On this weekend’s Open House, the designers of the Showtime Showhouse dish on how “Dexter,” “Weeds” and “Californication” inspired their dazzling rooms (watch the video above). We also get a personal tour of the iconic Steinway mansion in Astoria, Queens that was built by the piano-producing family and is currently listed at $2.5 million. Then tastemaker Jamie Drake warms up a cool, contemporary loft in Tribeca with cheery colors and cozy touches. How would you display your Heisman trophy? Pete Dawkins constructed a $19.5 million, 23,500-square-foot residence, where the coveted football award is proudly displayed. Finally, move over man caves: The mom cave has arrived. Interior designer Elaine Griffin shows us how to create a serene oasis for mothers.