Give us an example of someone's guild photo? If you just want a semi-transparent background, then you just have to change the opacity of the file in photoshop/gimp/paint.net, and then upload it under PNG. A reason why your file didn't come out right could also be because you're uploading it through your phone/ipod. All files are changed to jpeg once it gets sent to your photo album on your device(correct me if I'm wrong lol), which would then make the file opaque..