It's almost impossible to find it using Google without knowing my name. The graphics itself are only found inside a .zip-file on my Github, so impossible to find using Google Images.
It's not that I mind that much, I was mostly surprised by seeing this, not harmed. And actually on reflecting, I'm glad my project has helped you further completing yours. Use it as you like, that'll help you more than myself, since I stopped working on it. And in fact, I remember creating the topic specifically to help people who are thinking about making the same. So I'm kind of being a hypocrite right now, but it was on purpose.
Take this as a warning to be careful when copying stuff over the internet. Everything you find on the internet is automatically licensed except when explicitly said it is not (which is fundamentally wrong in my opinion) as Silvah said. When working on a bigger project this is pretty important to keep in mind.
So use it as you like. I'm glad I was able to help you
Wow, thanks for stealing my stuff...
Hmm. By investigating his code there doesn't seem to be many similarities at all. He might have taken inspiration from your code and application, but the only thing I can see he have stolen from you is the graphics, how is the graphics licensed? Did you create them yourself?
I did not inspect the code, since I did not have the time to do it. That's why I wrote 'stuff'
and yes I've created them myself with Paint!