Rather than do a thread on all the different mods I thought I would throw out a few picts highlighting some of my past ideas.
One of my first mods was an Ultra Aluminus mod where I soldered the wires to the back of the mobo for the first time.
I was using four 80 gig Hitachis in Raid0 and thought they looked a bit plain
Here they are in Red
The inside turned out to be pretty clean
Here is a shot showing how I cooled the passive GPUs and chipset
Here is a fan mod I made
Before
After
Here is the SFF case I put it in
Cool part of the fan was it could pivot in its mount, as well as slide in/out
Throw on a bit of color
those 3 controls at the front of the case were adjusters for the 3.3, 5 and 12V rails
And for perspective, its sitting next to a FSP PS box
(that comp is water cooled, is running 2 8800GTSs on a full size ATX mobo)