Assisting you is important to us and there are times when the members of this community who can best provide you with assistance to your particular issue or concern may not be available at the time of your post so please be patient while awaiting a reply. In the meantime, feel free to peruse the various sections of the iMore forum as well as the iMore Blog and check back periodically for a reply to your post. Thank you.
Octopus absolutely works on the iPhone 5 with iOS 6.1.2 and I have to imagine it's fine for 6.0. I would google around to see what the issue is. There is also another japanese swype keyboard out there but i'd stay away. I've only had bad experiences with it and it's packed with ads.
Ive used octopus on my iphone 5 with 6.1.2. It definitely works. I never really liked it much and ended up removing it. I also tried swype but I wasnt much faster with it.
If your looking for themes, use colorkeyboard. I have a simple orange keyboard but there are heavily themed ones available too.