Birthday Attack is a total gibberish wall of text. I realize that and I wanted to include an image to break up some of the monotony.
So I went looking for a suitable image to use. I thought a picture of a creeper would go well in the bit of Minecraft fan fiction I wrote to illustrate a birthday attack. My first stop was obviously Minepedia, where I found a great picture of a creeper, but I also found a scary copyright warning on the same page.
What that notice is saying is that the Minepedia is hosted on a Curse server, but they don't have the copyright because that belongs to Mojang, the creators of Minecraft. More importantly for my purposes, I did not find anything like a Creative Commons license. It's not a requirement, but I'd be more comfortable using an image with a clear status.