I'm used to deal with PNG images and I've made an optimized stashbox logo.
The original file has 181.589 bytes, and this one has 68.562 bytes without any quality loss. Additionally, it looks slightly better (see the left corner). I know this isn't too much but it can help to save some stashbox bandwidth anyway.
original file
optimized file
[IMG]http://img187.**************/img187/2237/toidz34.png[/IMG]
You may wish to use this one too:
[IMG]http://img22.**************/img22/42/thingsthatfuckus.png[/IMG]
Cheers and many thanks for stashbox.org!