Here is an example of what I mean by cover image for your brush/texture packs. This is the cover I did for an actual Photoshop brush pack I created with RetroSupply. I used only the brushes from the pack to make the cover art. 

Again, this cover image can be simply just for fun, or you can use it to help sell or share your pack online! Have fun and I am excited to see what y'all come up with!