I don't think this has been posted yet, but if you are looking for an alternate launcher, I found this APK on syndicate apps website that let's you install an Ice cream sandwich one.
You can just go on your Kindle Fire's browser and download it here
APK Release Warning & Caution
It's the one that says FREE ICS_2.4_Launcher.apk
Here is a youtube vid that explains how to do it, it's where i found out about the ICS launcher.
http://www.youtube.com/watch?v=W1gzXlXN1yk&feature=channel_video_title
You can just go on your Kindle Fire's browser and download it here
APK Release Warning & Caution
It's the one that says FREE ICS_2.4_Launcher.apk
Here is a youtube vid that explains how to do it, it's where i found out about the ICS launcher.
http://www.youtube.com/watch?v=W1gzXlXN1yk&feature=channel_video_title