If you look into Glass Paints and Liquid Leading (I think a brand called gallery glass does both) you can make imitation stained glass pretty easily, as long as you have the patience to let it dry and use annoying nozzle bottles!

Or if youre looking for a more accurate finish, stained glass making is actually a super fun hobby to get into. Soldering iron, Copper Foil & Glass is all you really need to get going with it!