Calluna is a serif font. It goes well with Sero, Source Sans, JAF Facit, Brandon Text, Apercu, GT Walsheim, Proxima Nova, Circular, Tungsten and FF Tisa Sans. 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.