Calluna is a serif font. It goes well with Brandon Text, Source Sans, Sero, JAF Facit, Le Beaune, Apercu, Calluna Sans, GT Walsheim, 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, education, portfolio, blog, illustration, sans serif, layers and finance. You can get it from Font Squirrel, Fontdeck, Fonts.com, Fontshop, Fontspring, MyFonts and Typekit.