Pt.js is a javascript plugin for creating interactive backgrounds with points, forms and spaces .
Freebies tagged patterns
Here’s a collection of high resolution halftone textures you are free to use as you want. Free PSD created and released by Dustin Lee.
Free Halftone Pack PSD
Here is a pack including 5 JPG geometric high resolution backgrounds (2500×2500 px) and the original AI file.
5 Geometric backgrounds JPG + AI
This is a simple pixel perfect, completely free blueprint pattern. The zip file contains a PSD and a PAT files. Source: Dmonzon.
Blueprint Patterns PSD PAT
Seamless blueprint textures for your designs. Included are 10 different patterns in Photoshop PAT format, PNG and PSD files.