thinnerthanb4, thanks for your advice!
Well, I actually have a very tiny figure - as in, my wrists and fingers and bones in general are very petite, I've small arms and even small hips - so, even though my weight is technically correct, I still have some fat to burn.
Perhaps it's a good idea to develop some muscle and burn fat, so that the weight would stay the same but I would look healthier? I don't want to build too much muscle on the other hand (I know it's virtually impossible for women to bulk up properly - just to clarify

, as my muscles (especially legs - like, thigh muscles and calves) are already a bit angular - or, prominent. My aim is a lean, proportional figure that would sort of match my bone structure.
I've come up with a diet for myself that keeps my weight at a steady level - during the week I mainly eat eggs and meat and some vegetables but over the weekend I also include some wholeameal bread or rice and things like that, and I try to eat regularly and not too little (I would normally forget to eat, especially in the morning - weird, but...).
Do you think circuits or Pilates would be good to tone up a bit and burn the excess fat? I know running is the best but I really dislike it (I've tried, was running for some two months regularly and then gave up - because I simply don't enjoy it) plus the weather is really moody where I live. What about yoga, to get more lean?
Thanks for any suggestions