We had a bit of a baseball bedroom when I was a kid since my sister had posters of the different Braves players. Yes, girls with baseball posters. What?
You can go a bit farther, though, with some really cool baseball bedding as a starter. Or add some baseball flair to whatever bedroom theme (or non-theme) you have going now with baseball lights (isn't that baseball field pendant amazing?), baseball wall decals and baseball decor and furniture. There are some amazing choices to show how much you love the sport without having to do your room up in a specific team color scheme. (Although, that would be cool too.)
Disclosure of Material Connection: Some of the links in the post above are affiliate links. This means if you click on the link and purchase the item, I will receive an affiliate commission, probably enough to get a stick of gum. I generally only recommend products or services on this blog that I would use personally and believe you will find cool as well. I am disclosing this in accordance with the Federal Trade Commission’s 16 CFR, Part 255: “Guides Concerning the Use of Endorsements and Testimonials in Advertising.”