*ouch* I completely forgot to post it, sorry... :doh:

Ok, I have uploaded the sources here (1.06 MB)
All that graphic stuff was converted by usenti, in the same manner as it is done for gba (more infos on fpc4gba tutorial).
The "Let it snow" tune was a mod file converted in wav by Open ModPlug Tracker; all wav samples have been converted to raw data with SOX, by using
Code:
sox -V let_it_snow.wav -r 11025 -s let_it_snow.raw
sox -V  hohoho.wav -s hohoho.raw
then I have converted the raw files in .o files with bin2s and arm-eabi-as.

That's all