Reddit mentions of BitFenix Alchemy Multisleeve 24-Pin 30cm ATX Extension Cable - Green Sleeve/Black Connector (BFA-MSC-24ATX45GK-RP)

They're really nice. Soft and flexible, so they can be bent to fit in tight spaces. The color is nice and bright as well. Connectors fit very snug

Amazon's selection and FrozenCPU's selection. They may be cheaper at one than the other, or actually even in stock

Here are the 3 that I bought for my X99 build, in bright green:

• 24-pin ATX extension, 30cm long
  
  
• 8-pin EPS
  
  
• 8-pin PCI-Express
  
  The color options are green, black, orange, red, blue, silver, white

If you have a non-modular, extensions are the way to go. They literally are extension cables that you plug in the mustard and ketchup cable in one end and the MB in the other.

Here is a green 24 pin motherboard extension:
http://www.amazon.com/BitFenix-Alchemy-Multisleeve-24-Pin-Extension/dp/B00HVBPQWS

And here is the 6pin PCIe for your GPU (x2):
http://www.amazon.com/BitFenix-Alchemy-Multisleeve-6-Pin-Extension/dp/B00HVBPCRM

>I want to build a black-green computer, but I want to keep the build in my budget of 1100.

You can't. First of all you're already past 1100. With a crappy version of the 970 (add another $15 to get a decent one).

The case you've selected comes with no window. No point in a vanity build without a window, so that's another $18.

Green Z mATX motherboard does not exist. Only the sniper Z87 which is $50 more expensive and in an ATX format. MSI is about to release a Z97 gaming /w green tones but it's not out yet nor is it mATX.

Green RAM is the Corsair LP 8GB ~$83, so $23 more.

Add a 12" decent green led fan, say a corsair SP, to replace the fan on the 212, another $15.

So just for the RAM, one LED fan and the window, you're already past $1200.

That's without say green braided cables (~$13 for the 24pin, $11 for 1x 8pin pcie and another $10 for the 6pin) or replacing the graphics card with the metalic referenced 970 which has green lighting on the card (another $20).

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If you want a good looking rig without spending too much, then here:

PCPartPicker part list / Price breakdown by merchant

Type|Item|Price

----|:----|:----
CPU | Intel Core i5-4690K 3.5GHz Quad-Core Processor | $212.99 @ NCIX US
CPU Cooler | Cooler Master Hyper 212 EVO 82.9 CFM Sleeve Bearing CPU Cooler | $30.99 @ SuperBiiz
Motherboard | MSI Z97-GAMING 5 ATX LGA1150 Motherboard | $146.99 @ Amazon
Memory | Mushkin Redline 8GB (2 x 4GB) DDR3-1866 Memory | $63.98 @ Newegg
Storage | Crucial MX100 256GB 2.5" Solid State Drive | $104.99 @ Amazon
Storage | Seagate Barracuda 1TB 3.5" 7200RPM Internal Hard Drive | $49.99 @ SuperBiiz
Video Card | MSI GeForce GTX 970 4GB Twin Frozr V Video Card | $345.99 @ B&H
Case | NZXT S340 (Black) ATX Mid Tower Case | $64.99 @ Micro Center
Power Supply | SeaSonic 620W 80+ Bronze Certified Fully-Modular ATX Power Supply | $54.99 @ Amazon
Operating System | Microsoft Windows 8.1 (OEM) (64-bit) | $97.99 @ SuperBiiz
| | Total
| Prices include shipping, taxes, and discounts when available | $1173.89
| Generated by PCPartPicker 2014-12-31 08:26 EST-0500 |

That's $1158 if you want to use rebates.

Better motherboard, faster RAM and in dual channel, better graphic card, case with window. Black/Red theme all around. Not mATX and no optical drive though.

https://www.amazon.com/BitFenix-Alchemy-Multisleeve-24-Pin-Extension/dp/B00HVBPQWS/ref=sr_1_fkmr2_2?ie=UTF8&qid=1473531268&sr=8-2-fkmr2&keywords=silverstone+sleeved+cables+green seems that they have some