This is our Silex install, using Composer for just some basic dependencies and H5BP/Twitter Bootstrap for some CSS goods.
This enviromment is great for prototyping and for small apps.
Get the install working with just these 3 lines:
git clone https://github.com/hisamu/silex-boilerplate.git && cd silex-boilerplate
curl -s http://getcomposer.org/installer | php
php composer.phar install