My concern is the wiring. It seems to be looped from the front panel switch. It may sound noobish but i dont want to balls it up. (my first build)
Then it'll get slightly trickier, T3X4S has a point, and if you have a steady hand, it will give a pinkish red glow, depending on the cellophane used.. So I would keep his suggestion in mind
If you went down the 'swap it out' route, then I'd start by tracing the fan wiring back to the case's switchboard, if they are plugged in, then you only need to unplug the old ones and plug in new ones, if the fan wiring is soldered on, then you might be left with the only option to cover the leds
Having said that, depending on your motherboard, you might be able to just snip the wires, (VOIDING YOUR WARRANTY possibly) and replace the fans that way, make special note to cover any exposed wires with insulation tape at the very least, and run the replacement fans directly from the board, if supported.
Please note, this is not recommended, I only posted it, as if it were me, it's what I would do if I could not live with white leds