After releasing a Dreamboard tweak for Kindle Fire For iPhone today, many (including myself) are expecting a similar release of a Kindle Fire For iPad to come soon. Amazon significantly customized the Android tablet software for their Kindle Fire tablet coming in a couple weeks to compete with the iPad 2.
Dreamboard and Winterboard themes are much more popular on the iPhone than they have been on the iPad. This is likely due to the sheer number of iPhones (100 million) that have been sold as compared to the iPad. The iPad 2 has also been very limited in jailbreak availability, the only version jailbroken for the iPad is iOS 4.3.3 with JailbreakMe.
Here is a quick tutorial for the Kindle Fire For iPhone theme from JailbreakZone on YouTube.