This is an idea inspired by mure being confused about the Birthday Key she still had in her inventory.
I thought it would be a cool idea if we got a Small Birthday Box or a Birthday Themed trait or maybe even a baby pony either on our birthdays or maybe the anniversary of starting our accounts. I just thought it would be nice to have a little appreciation gift... or something. It's always nice to get gifts on your birthday. ^_^
I don't quite remember if our birthdays were put in when we registered, but maybe we could add that somewhere if it's not there.
To prevent abuse, of course, the date we put in would not be able to change... which only applies if we're going by user birthdays and not account anniversaries.
And then, because I know there would probably need to be an expiration on collecting said item or whatever, maybe a collecting within a week starting on the day? That way if users didn't manage to log in exactly on the day, they could still have a time frame to get their gift and not be disappointed by not getting it... ya know?
Just thought I'd throw this out into the pool of suggestions, even if it doesn't end up being implemented.