There is an endless variety of colors and textures available from many manufacturers. There are gloss range options, color options, and texture options to select from when deciding what is right for your job. The condition of the parts should be considered when selecting a gloss range. Parts that have heavy grind marks would look better when painted with a flat, rather than a full gloss, because the gloss magnifies the grind marks. Custom colors can be made, but are expensive when ordered in small lots.
Most manufactures offer a multitude of colors that are readily available.
Stock colors tend to be a little less expensive, than specialized colors. Wrinkles, hammer tones, and minitext are the most common textured powders available. These powders are not only for cosmetic uses, but also are the best choice for parts that will get some abuse or have minor imperfections or blemishes. Pretreatment is critical for any paint process. The part must be cleaned well, so that the paint bonds to the surface.