Voltrey is a free Tumblr theme that comes with a highly elegant and modern design, which makes it one of the best Tumblr themes in our collection. This theme perfectly supports all types of posts. It even comes with options for changing the colors and different images across your blog. This theme also features group blog support. Not to mention, you can even post high-resolution images using this theme. This theme works perfectly on mobile and desktop devices. This theme is fully retina-ready as well. This theme comes with a vast area for the header image.