While levelling, I ran into a few mobs of interest! I found a purple shale spider and was amazed by their color & glow; I hadn't been intending to get one, but after hearing their Tron-like squeaks and squeals and watching that purple glow for awhile I had to keep it <3
I also ran into the Amethyst Scarab during the Uldum quest. I always keep an empty stable slot, and LOVED the colors, so nabbed one of those too. Later I found out it's only available during that phase of the quest--or is that phase the last?
Last but not least, I found Jadefang. SPOILERS -- At first I was infuriated trying to get to this mob, cursing Blizz and the silly devs--then I remembered the damn bomb from the terrible quest that I was doing. The crystals just hadn't been dropping, and for fun I'd blown myself all over a cavern earlier. After a few attempts trying to throw myself from the floor into Jadefang's cave, I managed to do it from the opposite (well, 90 degrees to the right of) cave. At that point, I realized the devs had designed a clever puzzle and I had to laugh! Then I had to decide whether to kill Jadefang for the minipet (I LOVE the minipet!) or tame. It was a hard choice, as I normally never kill tameable rares--especially uniques. But I already had a purple shale spider; in addition I'm a minipet collector, and lastly, I was powerleveling and no other (Horde at least) hunter was anywhere near Deepholm level. SO, I grabbed myself the Tiny Shale Spider minipet!
So I've wound up with a new purple beetle & shale spider, and am now camping for Karoma. (Edit--got her

How are you guys finding Cata pet-wise? What are your experiences so far? Story time!!