Made a quick mock-up of a potential template.
Fun fact (and it honestly just happened to work this way) the font size for the flavour text (e.g. "Thank You Iggy") is 12px, and the font size for "12" is 120px and I honestly think they look the best at this resolution for 125*125 avatars, and I tried to get the best use out of the Flames' official font face.
Images used and text is interchangeable of course but I imagine only a few variations need to be made, as seen below; the left being "home jersey" style, and right being a "borderless avatar/away jersey" style.
Curious to see what others come up with. This avatar *can* be made into an animated GIF but I honestly wanted a) to keep it simple and b) be kind of lazy at this point in time.