There are three things I make sure I do in my bathroom to make it my personal space (and try to forget that I share it with four little guys).
First, I always have flowers or a beautiful plant behind the toilet. It's lovely and always makes me smile as soon as I enter my bathroom. I love having gorgeous flowers in there -- not only do they look fabulous, they smell wonderful.
Second, I always lay out my beauty "goodies" as if it's my own personal beauty counter. I have my makeup, I have my lotions, I have my perfume, I have my hair gels and sprays. In short, I have everything right at my fingertips.
I have a system: my stuff on the left and my sons' stuff on the right. We don't cross lines (or I'll toss out toys!). It's easy for me because all of my stuff is so girly, and my sons are just not into it. It's nice to have my own little slice of "femininity" in my world of blue.
Third, I always spray some delicious fragrance in the air! My bathroom doesn't always smell great, so I rely on a little help from some perfumed scents to get me there. I love smelling a fresh, clean bathroom!