Creating a Frequently Used Slide Library for Reusable Presentation Content

Though we could definitely do it on our own by creating a separate deck to house them...it would be useful to be able to create a "Frequently Used" space or library. I have slides that I will use over an over, such as "Questions", "Break", "Demo", closing slide, and I can think of many others. Ideally it would maintain the structure and any images and adapt to the theme being used. Thank you...