Gulp gulpfile.js example configuration with WordPress child theme (Thematic)

gistfile1.js

// Load plugins
var gulp = require('gulp'),
    sass = require('gulp-ruby-sass'),
    autoprefixer = require('gulp-autoprefixer'),
    minifycss = require('gulp-minify-css'),
    rename = require('gulp-rename'),
    notify = require('gulp-notify'),
    imagemin = require('gulp-imagemin'),
    cache = require('gulp-cache'),
    livereload = require('gulp-livereload'),
    lr = require('tiny-lr'),
    server = lr();

// Styles
gulp.task('styles', function() {
  return gulp.src('scss/style.scss')
    .pipe(sass({
        style: 'expanded',
        compass: true,
        require: ['susy']
    }))
    .pipe(autoprefixer('last 2 version', 'safari 5', 'ie 8', 'ie 9', 'opera 12.1', 'ios 6', 'android 4'))
    .pipe(gulp.dest(''))
    .pipe(rename({ suffix: '.min' }))
    .pipe(minifycss())
    .pipe(gulp.dest(''))
    .pipe(livereload(server))
    .pipe(notify({ message: 'Styles task complete' }));
});


// Images
gulp.task('images', function() {
  return gulp.src('images/original/**/*')
    .pipe(cache(imagemin({ optimizationLevel: 5, progressive: true, interlaced: true })))
    .pipe(gulp.dest('images/'))
    .pipe(livereload(server))
    .pipe(notify({ message: 'Images task complete' }));
});


// Default task
gulp.task('default', ['styles', 'images', 'watch']);

// Watch
gulp.task('watch', function() {

    // Listen on port 35729
    server.listen(35729, function (err) {
        if (err) {
        return console.log(err);
    }

    // Watch .scss files
    gulp.watch('scss/*.scss', ['styles']);

    // Watch image files
    gulp.watch('images/**/*', ['images']);

    });

});

The file structure of how things are done is kind of wack, but that is because it is just a child theme.

Example for a different project (non-WordPress) https://gist.github.com/scottnix/10430003