On the legs (is this the right term? uprights?) of a shelving project I completed with my husband, I painted blocks of bright, vibrant greens (love a lime green these days, too), reds, purples, yellows, organges and blues. I left space between the blocks and stripes for thin lines of grey, which I applied in layers. The whole painting deal took about three hours of my time. (We used recycled oak shelves from Community Forklift.)
All colors can get along if you add grey.