I would paint the walls medium to light gray, including the baseboard. Would paint the vanity a darker shade of gray and change the hardware to modern stainless steel or glass. Replace the vanity mirror with a fancy trimmed silver mirror. Replace all the sink accessories with stainless steel with some bling. Find (or make) a shower curtain you love in dark green and grey and use either gray or dark green towels. A nice painting for the wall by the sink with a nice splash of yellow should make the room pop! Good luck!
look on line for bathroom makeovers...look at a lot! then determine which ones you like best and take a cue from them...
do you have a piece of the flooring color that you can hold? I would take this color sample to the paint store to see what matches to your lifestyle and this shade of green.
Go to the paint store,get samples and put a few where you can see them for a few days,eliminate each as you don't care for put up more with what is left and keep eliminating till you have the color you like. That is what I did after we built an eleven room house,it worked I loved all the colors chosen when done.
Sound coo thank you
More important than color! Prep the walls right and absolutely make sure you use paint meant for bathrooms - not just any latex. We learned the hard way!!