Generate sprite images and stylesheets with plain PHP and GD2 (no 3rd party dependencies)
PHP extension GD2
Add this in your composer.json
{
	"require": {
		"nfq-alpha/sprite-bundle": "dev-master@dev"
	}
}and then run
php composer.phar updatenew SpriteGenerator\SpriteGeneratorBundle(),You have to configure your sprites by adding lines to config.yml:
sprite_generator:
    sprites:
        spritename:
            inDir: %kernel.root_dir%/../src/Resources/public/img/sprites/
            outImage: %kernel.root_dir%/../src/Resources/public/img/sprite2.png
            outCss: %kernel.root_dir%/../src/Resources/public/scss/_sprites2.scss
            relativeImagePath: ../bundles/img/
            padding: 5
            spriteClass: sprite
            cssFormat: sass
            imagePositioning: one-column
            imageGenerator: gd2
        another_spritename:
            inDir: %kernel.root_dir%/../src/Resources/public/img/sprites/
            outImage: %kernel.root_dir%/../src/Resources/public/img/sprite2.png
            outCss: %kernel.root_dir%/../src/Resources/public/scss/_sprites2.scss
            relativeImagePath: ../bundles/img/
            padding: 5
            spriteClass: sprite_another
            cssFormat: sass
            imagePositioning: one-column
            imageGenerator: gd2Generate all your sprites :
$ php app/console nfq:sprite:generateGenerate one sprite :
$ php app/console nfq:sprite:generate spritename