Check out Redline Tuning for floor mats, Redline Goods for shift boots (names are coincidental), Steeda for shift knobs and HVAC knobs, Metal Monkey for gauges (UK company, not cheap), Rickbrook for knobs and boots (another UK company), and our How-To section here for cool ideas and tricks.
Mine: 2008 Saab 9-3 Aero SportCombi XWD: 88k, Black, Manual, JZW Stage 1. 320hp/400tq.
Gone: 2002 SVT, #1654
Hers: 2010 Focus SES: 80k, Ebony, Auto, Moon and Tune