Some Windows 7 themes by Microsoft include Beaches Panoramic, Reflections, Footpaths, Waterscapes and Scenes from Yosemite, as of June 2015. ExpoThemes also offers themes such as the Ant-Man theme, Assassin's Creed Syndicate theme and the Tomorrowland theme.
To access Microsoft's theme downloads, go to the Microsoft.com home page, click on Downloads, click on Personalization Gallery, and then select Themes. There are several categories of themes, such as Animals, Art, Holidays & Seasons, Places & Landscapes, Plants & Flowers, Natural Wonders and Movies. To download a theme, click on Download, and then Open. If interested in first previewing a theme's image collection, click on Details.
To access themes by ExpoThemes, go to the ExpoThemes.com home page and then click on Themes. Themes here mainly fall under three categories: Movies, Games and Celebrities. Click on a category title to view the themes available under it. To download a theme, click the title or the image of the description, and then click on the download link provided. The theme download page also highlights the content of the theme, such as the number of wallpapers and logon screens, as well as the operating systems that support the theme.
There are more Windows 7 themes at DreamScene.org, available by clicking on Windows 7 Themes at the home page.