Various graphical patterns (.pat files) can be typically created from both bitmap and vector sources and later applied to a new graphics file to fill out some elements with such a pattern.
Generally speaking, many graphics programs can create their own pattern through a dedicated function, typically found as some kind of pattern library.Open JPG file Open PAT file
A professional photo editor and manager for Windows
A set of applications used by professional graphic designers
A cross-platform batch image transcoder compatible with 500 picture image formats