Here is a build that I started in late 2014 and have been continuously upgrading throughout.
Listed prices are when I originally bought them or got them , either new, from eBay, friends, thrift stores, etc..
Originally started in a M-ITX case, I moved on to an ATX case when my buddy sold me his Kurosuke case. I saw much more upgrade potential and some experimental case modding too.
Obviously the paint job isn't perfect, I haven't done anything like this before, just bought a can of spray paint, took it outside and had fun. You can see where I sprayed too much and left quite a few of drips that just dried up, it also bled out to the back of the case, it was quite messy. Someone said I should've used painters tape (i had no idea), others said I shouldn't have sprayed too much (perhaps). After I was done with the main part of the case, I used the rest of the paint on the inner portion of the back side of the case so I can illuminate the back with an LED strip and add sort of an illusory back light. I then bought a pack of 5 yellow case fans from Amazon to complement the black and yellow theme I was going for. I also sawed a pen in half and used it as an anti-sag measure for the heavy card, didn't plan on spending money on an actual brace.
Performance-wise, it is what you would expect, yes most of my parts are pretty behind the latest trend, however I'm just gaming on 1080p on a 60 Hz monitor so I think I will be alright for a couple more years. The only thing I have overclocked in here is the random red (not yellow) RAM that I originally purchased so I had to just live with it, OC'd from 1600 MHz to 2000 MHz on XMP, everything else is running at stock speeds.
Not the most professional work, however I had fun, and was able to accomplish the look and theme I was going for =).