Drift
Based off its XenForo 1 successor, Drift brings it's many features back to XenForo 2. From adding your own banner, choosing either a fluid or fixed website design, this theme will still work with any style you choose.
More Drift Features:

• Standard, floating, or sticky navigation and userbar
• Vintage Apple look and feel
• Dozens of different search bar and navigation position variations
• Collapsible nodes, sidebar, postbit, and signatures
• Many types of category description types (tooltip, inline, or none at all)
• Different login styles such as modal window, dropdown, and slideout
• Option to remove the forum list page actions (New Posts and Post New Thread buttons)
• Edgy welcome banner statement
• Switch out the background image, node grid management, and so much more!
• Curvy finish like a sportscar