No matter how many episodes of HGTV shows you’ve seen, or the number of home decor magazines you’re subscribed to, there’s probably a few things in your home you would like to improve. The catch is, there might be a few more items to tack on the to-do list than you initially considered.

Interior designers spend a lot of time turning drab spaces into fabulous ones. So they’ve seen pretty much every home decor mistake in the book. These are some of the major eyesores they’ve spotted, ruining otherwise beautiful homes everywhere. Follow their advice to make sure your personal space isn’t another offender.

1. Themes are bad: Save your creative theme ideas for parties, not the inside of your home. Sure, a Star Wars shrine might’ve worked for your childhood and teenage bedrooms, but specific themes are overwhelming to the eye.