Wanted to share some pics of the additional lighting upgrades I've done in the past year. (once you start, you can't stop) Here's a summary of what I've done thus far:

Back-up/Reverse Lights - PIAA H-224 xtreme white, type 921
Dome Light (Front) - Raybrig R-133 T10 Dome light
Personal/Map Lights - Polarg M-17 Super White City Light
Dome Light (Rear) - Polarg M-28 T10 Medium Dome light
Cargo Lights - Polarg M-16 T8 small dome light
Front Door Courtesy Lights - MTEC T10 194 Wedge
Fog Lights - MTEC Cosmos Blue
High Beams (9005) - Luminics Pure Blue
Parking Lights - Polarg M4 194 Wedge
License Plate lights - MTEC T10 194 Wedge

 

reverse lights:

 

rear cargo lights:

 

another shot - rear cargo lights

 

driver & passenger door courtesy lights

 

front dome light:

 

front personal/map lights:

 

Rear license plate lights:

 

Rear dome light:

 

High beams - pictured in DRL mode to show how they appear much less yellow than stock. These are Luminics Pure Blue 9005:

 

Fog Lights:

 

lookin good, i love the rear license plate lights, i need to pic up a set of those

 

Nice job! Have you considered changing the scuff plate (amber) lights? I was wondering if anyone has done it yet. I searched the forum to no avail. I believe it's some kind of electroluminescent lighting and not LED's. If you have any clue on how to change these scuff plate lighting, let me know, thanks.

 

Nice job Rinse Out

The illum. scuff plates use 2 leds, not EL, on each ends. They light up a plastic engravings of the LEXUS logo.
They're sealed in, so you have to pop out the plastic coverings.

These were from an sc430 that I put into my GX:

 

How did you install your fog lights? The right side light appears to be reachable from the engine compartment once you remove the washer-fluid hose.

The left side appears to be the problem child. How did you get to this one? I was told that you have to remove the battery. Seems like a really poor Lexus design that you have to remove a battery to replace a fog light.