Here are all 3 of the holders I offer on this blog.
The mini gel pen holder works best on paper or cardstock and will give you very fine details. The mini gel pens offer 12 colors, they are available at all Staples and sell for $5 a pack.
The mini Sharpie offers 24 different colors and works best on glossy surfaces such as photos, clear acrylic, vinyl and more.
The micro mini Sharpie works best on the glossy surfaces as well, are available in 12 different colors and are ultra fine point so are even better with details.