Bdg-playn-blendtest is a project mainly written in Java, it's free.
Demonstrating Blending in PlayN
PlayN Blending Test
One of Many Big Dice Games Tutorials
By Dave LeCompte
One feature of PlayN that I had thought was missing at first was the ability to recolor my images (e.g. to have programmatically and dynamically colored cars in a driving game, or to have colored bitmapped text). Later, I thought that it was possible, but not reliable.
So, I built this sample to explore what compositing options were available, and which ones actually accomplished the results I wanted (SRC_OVER or DST_OVER go a long way to satisfying my needs).
Along the way, I realized that the HTML5 Canvas Global Composite Operations provide a sufficient toolset, but you have to be careful about how you use it in order to get the behavior you expect.
Hopefully, somebody else can benefit from my experiments.