I did manage to find the thread in the Intro forum. Thank you for the link to the Membership Manual. It doesn't really answer my question though. It explains what to do for a complete avatar change, but it doesn't really address small edits to the existing avatar.
What are the rules/regulations on making some minor changes to an avatar if you're a senior member (i.e. color change, crop, etc)? Also, where can I find this information for future reference? It might just be because it's really late and I'm half asleep, but I couldn't seem to find it.