There is an option — to make doors of sheet material and to paste over them with the same tile which was put on walls. It if you do not want that the case was allocated. Still it is possible to paste a mosaic of a suitable shade, to use a flexible tile (sheet plastic under a tile), to paste the washing wall-paper, cullets under painting, etc. Options actually weight.
If worry that the open cut can be damaged by humidity, it is possible to take a self-adhesive melamine furniture edge and it to process cuts. Simpler option — painting or a promazyvaniye water-repellent sealant.