I am still trying to wrap my head around why you would want this but based on two friends recommending it I decided to mention it. MMMOOO has released Pet Elf – Cute Mobile Peppy which is essentially a pink elephant that thinks it is a reindeer prancing around your homescreen. You cannot interact with peppy but his 3D movements are pretty funny. It also does not seem to slow down my device which is nice.
Check out Pet Elf in App World. It seems like it is free for a limited time but let us know what you find.