When I saw the 3.5 inch photo cube, I got excited! What a perfect item for what I will call a ‘ZenCube’. It’s been 6 months or more since creating it, and my skills have improved substantially, but I think it is worth sharing now. I first shared it at CZT-14 in Providence, RI., where it seemed to be well received. How to make the Zentangle ZenCube 
Purchase an acrylic 3.5” photo cube at Michaels in the framing department. I got it for about $4.00. I notice similar cubes online are much more expensive. Get 6 blank 3.5” square Zentangle tiles and number them on the back in pencil as shown in the photo below. I found numbering the tiles extremely helpful when drawing the string and tangling the tiles, especially when matching up how the top, bottom and sides interplay with each other. The numbering was also helpful when assembling the ZenCube. (By the way, T = Top, B = Bottom in the numbering scheme.) Be sure to retain the void-fill paperboard that comes in the cube, you will need it to hold the tiles in place. 
The next steps are to draw your strings, then tangles using the Zentangle Method, add coloring if desired, then and shading. In the photos below, I had colored the tiles before adding shading, using Tombow dual brush tip markers that I purchased from Amazon.com
