a design trade?
it's something like:
1) each person agrees to trade
2) they will both give a rough idea about what they want (colors, species, tall short, etc)
3) you draw!
4) you post!

pretty much how most trades go.

o.o basically, its like making a custom adoptable and trading.

you draw something to what the person had in mind, but still putting in your own style to it.
they do the same and you just trade, the person above put it in a clearer way ^_^ but i just wanted to add my two cents lol