I've mod some theme for corby, it's can use for S3650 and S3653.
You can search topics posted by hieutthh in http://forum.mysamsung.vn.
Sample here: sixTheme Ver2 For Corby by Hieutthh:
With sixTheme, you just update your fone with this firmware, using Multiloader 5.56.
And how to modified?
You creating your theme (flash type - *.swf)
Then you import to your RC1 file.
But how to import?
You can using winhex to search, and extract swf from RC1, same at SS Star.
Then, you will see 2 file theme.swf with different size.
U have to changed both of them, then save your RC1 and enjoy!
Easier, you can using themer 2.1, but with this software, you can only changing the RC1 in S3650XEIJ2 firmware.
I'm Vietnamese, sorry for my english skill...