http://www.art.eonworks.com/gallery/texture/texture_gallery_2.html This is where a few of the textures from the magnetcubes terrain came from, and more than a few infinity terrain builders have used them.
I just finished assembling something from those same textures... I had to play with the flip option to cover the letters, but aside from that it was just doing the job with Gimp and then adjusting the color (I had to let Photoshop to automatically scale colors and print the side with the pod accesses, or else would be printed too dark). The bottom, left uncovered, to show the cardboard nature of the item: View from the top: One of the sides: I used the three "double pod-access" textures (I had to use Photoshop and "auto select levels" so it would be printed in a visible color, instead of being a dark sludge). Full side: The other side, much simpler since it's the same texture repeated about 6 times: One end, with the "stairs". Edited, since it is a 3x3 composition (also, had to cut part of it, since it was a little too wide): The other end, it's the same but printed in a lighter color: I used an HP Deskjet 3270, thanks to Instant Ink I feel less remorseful about the printing tests (I had to discard 2 sheets), and the cost is almost nil. https://drive.google.com/file/d/11VJ8itKpSpzHxYt-A7QXG0k33m35cAD-/view?usp=sharing https://drive.google.com/file/d/1wewWWxTaK63lsQrdyNRPREwQcbxXmJkV/view?usp=sharing https://drive.google.com/file/d/1B3gDw7s1aXBx16f14vQXsAuebrsXU_W-/view?usp=sharing https://drive.google.com/file/d/11A4lufEy4jLK8WrgM8MPEMNLAflJ_e9s/view?usp=sharing https://drive.google.com/file/d/1vGyyacAb9cIW656jYE9vGmS1Ix6bIds2/view?usp=sharing https://drive.google.com/file/d/1zc67Yl98QzdrPm4ZngaNtq2JilVQayYe/view?usp=sharing
