I never used to bother with lip scrub, but now that I wear lipstick a bit more than I used to it's a staple. I always use it before wearing lipstick and the difference is definitely noticeable - my lipstick goes on more evenly. However I think the lip scrubs that are out there are a bit expensive for what they are so I made my own out of things I already had in my cupboards!
It's really easy to make, works well on my lips and also smells/tastes amazing! I mixed olive oil, petroleum jelly and peppermint food flavouring together and then added sugar to the mixture until it was the right consistency. It's the peppermint that makes it smell great for me, but I'm sure there are other things you could add if you'd prefer a different scent. Happy scrubbing!