Multiple techniques are possible for a whole range of applications and results. You can check some of them in this Transfer Techniques Collection by Linda Matthews: medium, paint, gel printing... If you prefer not to use a wet medium, maybe try tape transfer, explained here by Balzer Designs to make into jewellery:
Finally for even more inspiration, be sure to check topic 2016 #1: Transparent Art on this blog!
I hope this has given you plenty of food for thought as to a range of ways we can interpret and experiment with this theme TRANSPARENCY. As our bloggers create over the coming 3 months, their posts will touch on this theme alongside the monthly topic.