Not much to the interior, as of yet. Im currenty working on plans to have some panels painted and covered in leather. Going for a Black & Red scheme.
Blue LED's in Cluster
Blue Vaccum Florescent Display (Gear Selector & Odometer Read Out)
36 LED Array in Dome light
Two 12" Kicker CVX's.... New system in the makes
Pioneer 790BT HU
Aftermarket Power Windows & Locks
Suede Headliner & Visors
New Dash Curtosey of Chrysler
The '01-'05 Dodge Rams have BIG problems with the dash. I had several large cracks in the dash. There has been news stories on the issue. And even websites creaded just for the problem. After a month long battle, I was able to have my dash replaced by the dealer for a low deductable.
Cracked Dash Sites:
http://www.dodgeproblems.com/cracked-dashboard.shtml
http://www.carcomplaints.com/Dodge/Ram_1500/2002/accessories-interior/cracks_in_dashboard.shtml