I was thinking about slime pets with other cool things.
So first ill make it into different sections:
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PET SECTION:
I think slimes could be a wolf like creature. But when you tame them they are stronger then wolves. To tame them you get a potion jar (coming in 1.9 !). Right click on the slime with a EMPTY jar. In that you would see green. But, i was thinking different color variations.Colors like: Yellow, green, blue, pink,and white. If you capture two of these ones (different colored), you can combine them. Just put them anywhere in a crafting box. Every color would be in the game also. Not ones like baby blue and ETC.
Back to the pets. If you put 2 bottles filled with slime gel (it will have a color before slime gel) by each other it makes one bottle filled 1/2 the way. Do one 1/4 + 1/2 it makes a bottle appear 3/4 of the way up also then add one and it appears to be filled to the brim. You can also put 1/2 + 1/2 to get a full one also. When yo craft these the other bottle appears empty and the other one (in the done slot of crafting box) will be filled to how much you got it to. When you release them (right click), they will appear bigger the more it is filled. 4/4 of the way makes the slime medium sized. 1/4 of the way is small. 1/4 and 3/4 is between the other 2. The bigger, the tougher.
SPECIAL TYPES:
Thunder Slime - Shocks mobs.
Pig Slime - Produces slime pork.
Wool Slime - Generates wool.
Stone Slime - Slightly tougher.
Magma Slime - Lights mobs on fire.
Water Slime - Drops jar. Will spray water at fires.
So first ill make it into different sections:
Complipedia
Putting them in bottles.
Sorry if i did not give much detail on taming.
If I were a slime that were put into a bottle, I would be very annoyed and quite possibly uncomfortable.
Complipedia
In my opinion that the bottle will make slime feel safe and secure (like pokeball?)
And you can change the slime's power in a cauldron with ingredient?
Click them or they will click you
Well some of them you can only get out of breeding.
I did not understand what you said..