Based on Silex, it integrates RedBean for model handling and has got some nifty things on the front-end side too, using Gulp for asset management.
It is available via Composer and can be installed and started through the command line like this :
composer create-project neemzy/patchwork pizza
Find out more and contribute at GitHub, and spread the word !
Incidentally, Patchwork uses my RedBean service provider for Silex.