So that's the secret - searching for transparent PNG files! I always thought people were creating them every time.
Umma see what's out there, for inspiration. The possibilities are sooo much more... possible now.
Btw, coollew recommended an excellent photoshop-like tool. It's free and awesome. It's called paint.NET. I used it for one project and think you'll like it. First get the free Nitrite installer for it - you'll be glad you did.
Here's what I did with paint.NET; you might have seen it a few weeks ago, during the doMima era...
imgflip.com/i/27bbsp
As for the link - happy to delete if you think it's spam. Just an example of what coollew uses and I tried when he mentioned it.
And best of all, it's FREE! :-)