I presume you're talking the avatar images? All of them (except for my current one - red blindfold) are derived from H-games. I cut out the characters and made the backgrounds and border. This one also received the cut-out and background treatment, but it isn't from an H-game. Instead, it's some fan-art for Touhou that I ran across.
I suppose I had a few ideas in mind when I chose to use it as a theme for my avatars:
1) A person's eyes are regarded as being the "gateway to the soul." Yet through the internet you can't see my eyes, and you can't get a good feel for my "soul." Thus the avatar, which is by definition supposed to represent a manifestation of you, the eyes remain covered.
2) The personified form of te lady Justice is blindfolded. The reason for the blindfold in Justice is that it's supposed to represent fairness and equality; that no unfair judgements (perhaps based on superficial elements) are being made. I took it to show that I'm attempting to be non-judgemental in my dealings with others.
3) Mystery. There will always be more to discover about people on the internet, yet what is shown is often very selective. The blindfold is a reminder that not everything is revealed.
I suppose more interpretations could be made, as well.
Hmm... not really. Birthdays have long since become just another day. I don't throw big parties any more, but close friends and relatives will "celebrate" the day all the same. It's more meaningful that way.