If you don‘t have photoshop here is a free way to match colours.
Right click on the image you want to break down ( copy image URL), we have used the Peppermint Mag cover from this post.
Click on to the Colour Palette Generator website, then on the right hand side there is a space to paste the URL:
Once you‘ve dropped it in this is what you‘ll get:
Thanks to Ez from Creature Comforts, man have you seen her blog? You will be on there all day...