I picked up a great Photoshop trick from Twitter user @Treatscraft. This is a quick and easy way to try out different color ideas based off of another image. Simply go to Image_>Adjustments> Match colors. From there choose the opened image you want to sample colors from. You can find the informative post here –> Tweet.
This is just a short clip from a great tutorial by Strawberriice over at Deviantart (here). Another great way to pick colors that I need to keep in mind.