153w ago - I just figured out how to create a custom PS3 boot logo for those interested by simply modifying a PlayStation 3 RAF file. Here is a sample. Replace coldboot.raf in flash with this one (or use the CFW Loader or whatever) and reboot PS3 and see your new Bootlogo!
Apparently this DOESN'T work for HD people yet. I don't know what happens on an HD screen, I replaced the HD file with LOL but I don't know if it will work. I'm writing a full tutorial on this, so expect it soon.
Edit: My guide is now posted below! Here's basically how I did it:
Used SimplyZip (http://www.paehl.de/english.php) to decompress the RAF starting at the Zlib header (78DA) to the end of the file.
Now that you have the RAF file decompressed, it's basically a P3T (yes, Sony are that lazy) After this, you just need to run it through P3T Decompiler or whatever because you can't actually get the source files for the logo (no converter will convert them properly and I can't manually get them to show) you need to create a DDS File with these sizes:
Any gtf with _sd in the name - Standard Definition - 240 x 120