With the recent update, Making decorated cooking pots seems like it could be highly profitable, will report back after research.
Right now it seems that you can-not trade them once a rune is used, and it is slightly difficult to sell them on the GE. However i did have luck at selling 500 of them at 5k each (2.5mill) and it only took about 3 to 4 hours
HOWEVER this needs no start up money (or about 5g for a bronze pick and a bucket) and is super simple.
I currently rate it at a four out of five, but this should change fast as the demand will surly drop.