Illustfolio 4 is a free clean Tumblr theme that comes with a minimal and straightforward layout. This theme comes with a responsive design primarily built for photo galleries. If you are looking for a good Tumblr theme to display your portfolio, this theme might come handy for you. This theme supports all post types. You can either choose to use single or more than one column with this theme. This theme also features share buttons for sharing your blog on different social media websites. This theme also comes with customizable fonts, colors, etc. Not to mention, the logo image on the header area is also fully customizable.