Re: 2006 Rear View Mirror AND Floor Mats
1) WeatherTech floor mats are da bomb. (That means they're really good.)
2) Before you get too far gone in your mirrors, check the price of mirror assemblies on RockAuto.com . Assuming they have the version that matches your Sienna's options, they're surprisingly cheap. They only come in black, not body color. You can also get the glass separately, too.
(edit: doesn't look like they have the power folding version. Perhaps you could replace with the plebeian manually folding version?)
In my experience with other vehicles, loose mirrors are a sign of a previous botched repair attempt, so you may need to account for missing, bent, stripped, or damaged spacers, trim, weatherstripping, mounting points, fasteners, etc. before you can just bolt in a new assembly.
Hard to say without seeing the situation firsthand, but odds are someone has monkeyed with it before and screwed up something.
2010 Toyota Sienna LE
The fastest grey color.