Graphic Designer needed to create custom box sleeves

I am transitioning my build a box from a full box design to an interchangeable box sleeve. I need sleeves designed for multiple occasions and I need them to embody our sass and vibe. I am at the beginning stages of this project and still doing research on how this is done. I will attach some sleeve images so you know what I am looking to have created. Mind you, these are not designed for me, they are simply to show you what I am trying to create for my boxes. My boxes come in 2 sizes 9x6x4 and 12x8x4.5.