Here's your chance to really go nuts in terms of the impractical. Think SkyMall catalog meets "This Old House" -- one-time gadgets that will really put a luxurious touch on the bathroom and only seem frivolous until you actually use them. We're talking heated towel racks, automatic toothpaste dispensers and bathroom cleaning robots (though you may have to wait a little while 'til those are on the market).
And while gadgets are great, there are also plenty of finishing touches you can get to finish off the bathroom -- even some luxurious ones that are affordable, too. Think about things that your DIYer may not have thought of himself, like springing for that eco-friendly bamboo flooring, running an electric tile-warming net underneath a new set of tiles or embedding LED lights (which are great when someone has to get up in the night but doesn't want to wake up his or her partner).
Anyone who's remodeling is definitely operating under a budget, which means he's had to drop some things to cut corners. This is your chance to put those corners back in.