Eh, I don't really like the idea of spliced Creatu. It'd be a lot of work for the artists to make every combination of pets possible.
This was suggested before, if I remember right, and people didn't really go for it. Some people did like the idea of a "spliced" Creatu, but it was more of a new species that no matter what kind of "body parts" you contributed, it came out the same kind of creatu, like Frankenstein's monster.

The idea of a Void is an interesting concept however, and rather possible future plot once Uldavi develops more. Uldavi is a far off planet, and they probably have more technology than the four Elemental Planets. Perhaps after Uldavi develops more, some sort of Black Hole or Rift could be discovered and using Uldavi technology, the user could explore said location and find new, more gruesome pets and items, which could kinda tie in with some users wanting more boyish and non-cute pets.

OHEMGEE. -in totes support of every word Loki said- I. Need to live in Uldavi. O _ O

Cool! I've got more ideas of cool worlds. Oh. I've got another Idea. Making a Weapon Shelf since the Training Battle Areas aren't up yet.

What would a Weapon Shelf do? Like... be another storage specifically for battle related items?
To be honest, I'm not even sure if weapon-like items are coded to be able to equip to pets, to be quite honest. Then again, I wouldn't really know because the Battle Area has never been up for the nearly two years I've been on Res. o-o;

Be a storage for weapons like the Squishy Shelf is for Squishies. Basically a Shelf made for those who want to collect weapons.  You know collecting means only.