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.
On The Hunt For The Perfect DIY Toddler Beds & Reading Nooks FREE tutorial for the diy bunk bed loft with reading room / playhouse beneath! DIY loft bed for kids! From Outstanding to Easy: 20 DIY Toddler Beds
DIY use a picture frame as a towel bar. i love this idea & how the collage of frames decorates the wall. so much cooler than just hanging a towel rod! Use cool funky shaped frames painted fun colors for kids' bathroom?
Basement bathroom door for cleaning supplies. Kitchen to basement door for pantry items. Back of girls' door for barbies. Inside girls' closet for shoes. Inside my closet door for belts and scarves. Entry door for shoes, mittens, etc.