The kitchen floor that I made using Les Chinoiseries wallpaper tile came with a border attached and I couldn't decide if that border would be too much so I had cut it off initially. I had also glued it to a piece of thin white acrylic, which I thought would be more sturdy than the posterboard I had used with some tile that I had played around with early on.
Subsequently, I went back to it and decided I needed to use a better base - the glue was coming off of the acrylic. Turns out crescent board is too thick and I went back to a bristol board I'd used in other houses. So next was figuring out which part of the border (or all of it) I wanted to use. I ended up using the smaller border. It's probably not a big deal, because most of it is covered by cabinets.