Calluna is a serif font. It goes well with Source Sans, JAF Facit, Brandon Text, Sero, Apercu, GT Walsheim, Proxima Nova, Tungsten, FF Tisa Sans and Bebas Neue. If you're thinking about using Calluna then try 16px for headers. Give 20px a shot for content.
People commonly tag it as writing, magazine, design, layers, portfolio, blog, illustration, sans serif, music and elegant. You can get it from Font Squirrel, Fontdeck, Fonts.com, Fontshop, Fontspring, MyFonts and Typekit.