These are some items I'd like to see.

Smoking Green Potion: "Ugh, what is this? It smells disgusting! You probably shouldn't give this stuff to your Creatu." - Changes any non-CS Creatu into a mutant. Bought in CS for 50 cash points or 100 credits, packs of 5 for 230 cash points.

Bottle of Holidays: "Mmm, you can smell the holidays in here! It's full of ribbons, sparkles and yummy cookies!" - Changes any Creatu into an Easero, Kurrabi, Uilius, Narwi or Iluvu. Creatu keeps its color and mutant effect (if it is one). Obtained through a rare random event on Valentine's day, Christmas eve or Christmas day.

Mysterious Swirly Smoke: "It seems to envelop you in a rainbow. It's strange how it doesn't drift away... it must be magic!" - Changes a Creatu into any color (even G&S and Uldavian, if the Creatu is available in that color). Bought in a pack of two in the CS for 250 cash points.

~More items will be added as I think of them~
~~If the staff decides to make any of these, they may change the name/price/deion/effect/method of obtaining. This post is merely a suggestion for these items.~~

And I really support your ideas. Those seem amazing!