I know what I'm saying is just because changes are made, doesn't mean members will readily adapt to the change. After a change like this is made it might give the impression that the resource author doesn't care about uploading icons. Letting them default to their avatar until they make the change will make the Resource List not look so bad.
While I tend to agree that there could be an admin option allowing uploaders to use their avatar image as the resource icon, I don't find the default icon that bad looking...
I love what @Shelley did.. It makes her add-ons stand out. Which with her talent, they indeed should. I do hope the neon color changes monthly and an easter egg of a tooth brush is hidden within.