I don't think I would use black shower curtains to make a room look larger, but the idea is a good one. Maybe curtains the same color as the tile, or a loghter shade of taupe. Floor-to-ceiling shower curtains. Make a small bathroom feel more luxurious.
Add depth to spray bottle art by mixing touches of gold or silver leaf in with other colors. After all colors are added to the canvas, apply the gold or silver leaf to the surface using leaf adhesive and a small detail paintbrush.
Small-Space Living Tricks That Make a Big Difference