Look at color combinations used in graffiti murals, such as those broken down by Build Internet and COLOURlovers. Need more inspiration? Hit the streets of any urban area and take photos of the graffiti pieces that catch your eye. Create a minimal design by using the color schemes of cool, raw graffiti that inspires you. On websites, that could mean using the colors on navigation buttons; when designing a room, the colors could be used to reupholster or paint walls.
Use blown-up elements of graffiti to design your documents and website or blog backgrounds. Graffiti is full of beautiful characteristics, like drips or areas of slight over-spray where the use of spray paint is evident in the final product. Use these elements minimally, like in one corner of your letterhead or blog page, for the most impact.
Mimic the uses of geometry and interlocking forms that's evident in wildstyle graffiti. These dynamic shapes and lines could work well on textiles, t-shirts or even printed on art paper and framed. Furniture designers may also find inspiration in raw graffiti when designing modular pieces like chairs that interlock with their matching table when not in use.
Use all of the elements of graffiti art--extreme colors, geometry, and elements specific to graffiti as a medium--to design a full mural or wildstyle piece to be painted on a wall of a home, restaurant or office. Such a mural would be appropriate painted on a wall of exposed brick, though it also works on a flat surface.