Texturegen
Texturegen provides free high-resolution textures and backgrounds. As of September 2015, there are more than 1,100 textures available. Users can search by keywords or browse by categories.
Pixabay
Pixabay is a photo community that provides images on public domain. The site contains curated images contributed by photographers around the world. As of September 2015, there are more than 470,000 photographs, vectors and illustrations. Users can search by keywords or browse by various categories.
Google Material Icons
Google developed a visual language that “synthesizes the classic principles of good design with the innovation and possibility of technology and science”, which they called “material design”. Google retains a living document of specifications of the material design. As part of the specifications, Google provides a library of system icons, created based on Google’s design principles, for download. Users can search or browse the icons arranged by categories.
Split Shire
Developed by Italian photographer and graphic designer, Daniel Nanescu, Split Shire provides copyright-free photographs for designers, bloggers, social marketeers and commercial companies. Users can search or browse images by categories.
Freepik
From vectors to PSD files, icons and stock photos, Freepik provides resources for graphic and web design. As of August 2015, the site has received more than 440 million downloads. Developed by “a team of designers, developers, professionals of marketing, communication and administration” based in Spain, Freepik offers two types of content: free and exclusive graphic resources by Freepik, and graphic resources belonging to others. Users can search or browse by categories.
British Library Flickr Commons
Since 2013, British Library released more than 1 million images to Flickr Commons. The images were obtained from the Library’s digitised collection of 65,000 books of the 17th, 18th and 19th century. The release of these images indicates the Library’s desire “to improve knowledge of and about them, to enable novel and unexpected ways of using them, and to begin working with researchers to explore and interpret large scale digital collections”. The images are arranged by different themes, such as book covers, illustrated letters, maps, flora and children book illustrations.
IM Free Collections
Provided by web design agency, IM Creator Ltd., IM Free Collections is “a curated collection of free web design resources”. The images are from various image sources that provided these images on Creative Commons licenses. Users can search or browse by various categories.
Pattern Library
The Pattern Library is an ongoing project that compiles patterns by designers. The site is developed by Tim Holman and Claudio Guglieri.
Subtle Patterns
Created and curated by Atle Mo, Subtle Patterns is a free resource for textured patterns. Users can also purchase their plugin to use their resource directly from Adobe Photoshop.
Noun Project
Launched in 2010, The Noun Project is an online catalog of downloadable icons and symbols submitted by designers around the world. Users may search for png or editable svg files of the icons.