As described here
as an exercise, I turned Moo-Point (a WordPress theme derived from Sandbox) to a child theme of Sandbox.
I named it Calf (the name is a joke, of course).
Naturally its license is the same of Sanbox/Moo-Point (GPL).
I'm going - for its next release - to port even its missing custom menubar (and perpahs adding a kind css for icons).
I'm here to collect suggestions/requests.