My modified Rose pasted onto a box. This has the rose in the center, so a top-down view in your editor should allow you to select any side (be sure to include the inside of the bottom and the extruded part of the lid) and resize. I've made a longer box as a demo.
Rose_box_bottom.stl | 1.4KB | |
Rose_box_Bottom_L.stl | 1.4KB | |
Rose_box_top.stl | 12.5MB | |
Rose_box_Top_L.stl | 11.9MB |