Just thought I'd post some of my work.
This was my first case! I did it back in 2005 for a friend who re-upped.

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I think it's the flash that makes it look this way, in person it's just OD green. Well that and I added lettering "Marines" to the side, and a red diamond on front with an EGA from the dress blues cover. Forgot to get pics though...Damned stomach virus!
(Notice the M1A1 Abrams on the window, I also had a couple of green LEDs on the side that really set that off.)
After going through a couple of practise cases, and general painting I did this for my nephew. It was an old HP.
Then this; which is both a homage to my favorite NHL team, and processor at that time, the Athlon 64x2 4400+.
Got bored happened to have an old Raidmax and...Well I think it was my best case to date.
These were commission work, and I had fun doing them.
This is where my current system resides, even though I'm working on a new case for it. (Based on the Black Templar theme from Warhammer 40K)
Anyway I hope this inspires somebody, painting a case is fun and as I stated before in another thread it takes ultra balls to make that commitment, and practice makes perfect.
Thanks for looking!