This was my first water-cooled build. I'm a big Iron Man fan, so I went for a red/gold/silver theme.
It's a couple years old as of this posting, though. (I only recently discovered this site!)

Detailed list of parts:

Computer Parts List:

Corsair 1000D case
Intel Core I9-9900K
EVGA RTX 2080 TI
Samsung 970 Pro 512G
Corsair MP510 960G
ASRock Taichi Z390
G.Skill DDR4 3200 32G
EVGA SuperNova 1600 P2
Phanteks 600mm PCI-E Riser Cable

Cooling Parts List:

Alphacool 480 XT45 radiators
Alphacool 360 XT45 X-Flow radiator
Barrow gold 16mm hard tube fittings
Barrow gold 45/90/etc adapters
Bitspower Ice Red 16mm hard-tubing
Alphacool Eisblock XPX CPU block
Mayhems Blitz Pro Cleaning System
Mayhems XT-1 Nuke Coolant
Alphacool temperature sensor plug
Alphacool VPP655 Eisdecke D5 - Plexi
EK-Vector RTX 2080 TI GPU block
Grizzly Kryonaut Thermal Grease
EK M.2 NVMe Heatsinks

Fans:

Alphacool Eiszyklon Aurora RGB 1300rpm (120mm)
XSPC 8-way PWM Splitter hub

Lighting:

XSPC Twin Red LEDs (lighting the pump heads) 3mm
Alphacool Aurora XPX RGB Frame
Phanteks Halos Digital RGB fan frames
Monsoon MMRS CCFL 200mm Plug blue
XSPC 8-way RGB Splitter hubs

Sleeving:

MC Custom 16AWG Wire (black and white)
Teleios Billet Gray/Gold/Red sleeving
Molex ATX terminals/connectors
PCIE connectors
EPS connectors
Alphacool Eiskamm cable combs (I'd have used Clockwerk Industries' combs if I knew about them earlier)

Tools:

MDPC-X Crimp Tool (CTX3 for crimping connectors onto the wires)
MDPC-X heatshrink (small)
Molex Pinremover
Monsoon Hardline Pro Measuring Kit
PPCS Tube/Pipe reamer
Monsoon Harline Pro heatgun kit

Patience:

Lots of it