This is a step-by-step of how I custom painted my nintendo 64 for no money
Step 1: Open 'er Up!
In order to get a clean paint job and avoid gumming up the works, you'll want to remove the plastic shell from the n64 in order to paint it.
the first obstacle here is the screws on the bottom. there are six of them, and they require a certain type of screwdriver. It's called a 4.5 mm gamebit and it works for n64 and gamecube (picture included). If you plan on taking apart a lot of nintendo consoles, I think it's a good investment but if you are like me and hesitant to purchase things off the internet for one time use only, don't fear! there is another way and it involves a bic pen (those clear plastic ones work best- again, pic included). here's what you do. unplug the n64 and remove the game cartridge and the jumper pack. flip it over, belly up. remove the ink and cap from the bic pen. you can use either end of the pen for this next step but I found the butt end was more durable. hold the end of the plastic pen tube over a flame to soften the plastic. you don't want the plastic to get drippy, but it should be fairly soft. Then jam the soft end down onto one of the screws and hold it until it dries. VOILA! a cheap gamebit screwdriver! the only problem is that these wear out quickly and they are A LOT harder to make once the screws are already out so I would recommend making one new one for each screw you remove, that way you will be sure to have plenty when you go to put the screws back in. ( this way you will only need 3 pens because you can use both ends)