Scented Candles and a lovely headboard will make it a sexier place to work. Make sure the candles are away from any curtains etc (common sense). I don't turn on the overhead light as I don't find it sexy in the slightest, although I have replaced the shade with a really nice one to bring the look of the room together a bit better. I use small table lamps. Personally, I don't like glitter lamps but everyone's taste is different isn't it.
Dress your bed with scatter cushions and a nice throw. Textures will make the room feel more appealing and inviting. Maybe little rugs next to either side of the bed. Makes life easier if you end up kneeling there - or your client does! Much easier to clean than the entire carpet too.
For the walls, I agree with Anika. I'd also put up a shelf to accomodate little sound system and a couple of cd's or even a vase of nice flowers.
I've also moved into a furnished flat so have been mooching for ideas over the past few weeks and buying bits and bobs. Remember that it'll come together eventually. Mine is beginning to reflect me and it's actually a lovely room to work in now!
Good Luck, Love Alex x