I can see posts here on the forum saying that people have created appliances such as
And quite a few others.
But where are they? They certainly aren't on your website to download...
If you have a read through the blogs (and forums) you will see that there has been a development competition and these are some of the entries. The core devs are currently going through them and many of them will make it into part 2 of the current release cycle. If you are keen you can try them out using TKLPatch to patch the ISO. Or just be patient and wait until they are officially released.
More information about text formats