You can get a lot of pretty good looks for an electric guitar using spray paint. Doing a spray paint job on an old electric is actually popular with some musicians, especially if the paint job covers up unappealing branding on generic models or cosmetic damage on the original paint job. Here's how to get a spray paint design onto your guitar.
Pick your colors. Get a can of each color.
Cover up parts you don't want painted. This is a critical step because you usually only want to paint the body of the guitar. Other parts that you don't want to paint include the headstock and neck as well as items set into the body like pickups and other hardware. You can cover these smaller items with tape and the larger areas with a cloth or paper.
Get a work space. You'll want to lay paper down so as not to get paint on the floor. Choose a solid color or an abstract color-mixing design.
Start spraying, holding the spray can just close enough to the guitar so that the paint doesn't puddle. Hold it close enough that the spray paint won't dissipate or get all over everything around you. Continue spraying in even, consistent motions with the solid color and then, if necessary, with the overlay color. Using two colors can get a good "doppled" look.
Use creative strategies to get your paint onto the whole body of the guitar. You can put your guitar up on wood blocks and switch sides by grabbing the covered headstock and turning to spray the underside.
Do any creative design while the paint is still wet. Skilled spray painters know how to use circular or line tools to make specific designs on the guitar body. You can use crumpled newspaper to make "veins" in the paint by twisting it on the body while the paint is still wet.
Let your guitar dry, then uncover the parts.