Just as long as you don't use a proper bread tin as they are folded on the edges and I wouldn't use mine with an icecream batch 
Just line it with plastic wrap - you can use anything as a mold with the use of plastic wrap. I have antique copper molds that make beautiful ice cream molds. Any metal will also transfer the cold into the mass more rapidly than plastic or glass.
I use a sheet pan - also called "jelly roll pan" as the sides are deep enough to keep the bag opening above the level of the cream.
If you want to make a thick "shell" of ice cream, just put a generous sheet of plastic wrap over the top of of partially frozen ice cream and press glass jars (empty but with the cap) down into the slush.
Once completely frozen, remove the jars and you can then fill the "tunnel" with another flavor of ice cream or with chocolate mousse, or ?? that will freeze - the "filling" had to be cool so as to not melt the ice cream too much.
I've done this with a bundt pan and used baby food jars (I have a box full that really come in handy for lots of things) placed end to end around the ring.
I wouldn't use any filled jars because I would worry that the contents would freeze and cause the lids to pop.
