Project gone wrong - Tiling the Window Frame

There is a window in the bathtub area that I thought would be cool to cover in mosaic tiles.

Even though I was able to glue the tiles to the window frame, I was not able to place grout neatly between the tiles. And I could not close the window.

Since the tiling did not work I went with painting the frame red. I chose red because it is an unexpected welcome of color.