Would it be odd / tacky to put up signed pictures of astronauts in my office?

I'm posting this here instead of a career sub because this is more of a regional question than just a jobs question.

I was recently promoted and have an office now. I was advised to bring in some personal items so the office doesn't look so bare and sterile. I work for a financial institution, we are not related to NASA / JSC in any manner. But I have two signed photographs of astronauts I was thinking of bringing in. Would you think it's odd or childish if you saw a coworker or your boss with these photos in their office? I currently have a few Funco figures in there along with my diploma which is pretty standard here.