LED circuit powered by 12 volt molex

I want to set up a LED backlight/glow kind of thing for my computer.

My power supply offers 12 volt molex plugs, so I would start by getting an old molex plug and using that. Then I want to get 8 blue LED lights and link them up to the molex. My question to you people is what kind of circuit would I need to set this up? After discussions with various people I got mixed results, some say a simple parallel circuit would distribute the power evenly, others say I would need resistors and make something like 2x 4 LED series circuits at 6V each. Ideally I would like to have it in a rectangular shape, like my motherboard, so please keep that in mind where possible (i.e. Its easy enough to make a parallel circuit in a line, a box is slightly harder). I have basic soldering/circuit knowledge, but it doesnt extend far so please keep it simply worded?

Thanks
Tom

 

That is sort of what I expected, so from the positive end, I want the positive to split to all 8 LEDs, with a resistor between the positive and the LED, and then every LED to lead back to the negative?

And how do I figure out what kind of resistors I need if the power source is 12V? (that may have been in there, sorry if I didn't pick it up (ok, I do see an explanation now, but I cant make sense of it =/))