Smile for the camera! Well, in this case, smile for the bedroom.
Whether traditional bright yellow or lots of rainbow colors, smiley faces are just a fun touch to add to the bedroom. And there are lots of touches you can add these days, from rugs for the floor to posters for the walls. And don't forget all the smiley faces you can find in cute little items like banks and vases and even a bean bag chair.
Smiley faces make great bedroom decor because they're fun and don't have to be tied to a specific theme to look great. That said, they definitely work with retro ideas like peace signs and tie dye. Groovy, man. Consider adding them to other brightly colored themes like Legos or rainbows or Sesame Street. Or maybe mix them in with polka dots.