A vertical standing tube res with a white led strip behind it (maybe cover the LED strip in thin black cloth (muslin, tights that kind of thing) to make it merely lit up and not have the LEDs reflecting all over the place) next to the HDD cage could look quite good.
Intel i5 2500K (4.5 GHz) | Asus Z77 Sabertooth | 8GB Corsair Vengeance LP 1600MHz | Gigabyte Windforcex3 HD 7950 | Crucial M4 128GB | Asus Xonar DGX | Samson SR 850 | Zalman ZM-Mic1 | Western Digital Caviar Blue 500GB | Noctua NH-U12P SE2 | Fractal Design Arc Midi | Corsair HX650
I'm frankly not a fan of LEDs, so that's not happening. Especially with my brother, who doesn't even fancy aesthetics at all. However, we agreed that the bay-mounted reservoir is a PITA to work with and is more hassle than it's worth, so we want to replace it.
Just as a small tip: put the snake pit behind the hdd's, there is enough room.
Also, why on earth are you using those Molex -> PCIe adapters, when your psu has PCIe connectors?
If you mean the cables towards the front panel, then that's a no-go. I have 2x 120mm fans in there as you can see from the pic.
As for the Molex -> PCIe adapter thing. I'll quote your sig: "Why do something simple, when there is a complicated way?" (the day i installed the new parts was a low sleep/super tired day. I grabbed the molex from my old GPU, and installed it to my new GPU. So that's my bad! )