One replacement tile for the (now discontinued) Rubik's Blind Cube, which was a twisty puzzle produced by Ideal Toy Corporation (and Arxon) in 1981.
This replacement tile is for the yellow side of the cube and features a cross or plus sign. The recommended material is Yellow Strong & Flexible Polished (which is fairly close to the original yellow plastic), but the tile is also available in White Strong & Flexible (if you want to paint or dye the tile yourself).
If you have a Rubik's Blind Cube which is missing a yellow tile, simply attach this replacement tile by adding a small amount of super glue.
Also, you can build a blind cube from scratch by gluing the appropriate number of tiles to an untiled/unstickered cube.
Note about color consistency: Due to the inherent variability of the dyeing process, color may vary slightly in separate orders (or even within the same order). Therefore, if you plan to order multiple tiles of the same color and if you want to avoid color discrepancies as much as possible, you should order them together and then you should email Shapeways requesting to add a note in their system to have the tiles dyed at the same time (and for the same duration).