We root our cuttings in the wonderful glass cups from Trader Joe's Spega yogurt. The baskets from AeroGrow's Master Gardener Kit fit perfectly in the rim.
These cups are also a handy place to set any small plant when it needs to be taken out of the AG for any reason. The cups keep the basket from falling over as well as keeping drips off the table. The yogurt was good, too.
This plant is a little ratty, but mint is forgiving:
