For solo girl, I pretty much only want to see fingers. I'm not a fan of seeing dildos or vibrators.
For girl-girl, I prefer mostly tongue/finger/kissing action for the majority of the scene. I don't mind toys, but I don't want to see fake titty fucking or bjs on the toy. I'm a big fan of the double dong and girls going ass-to-ass in my lesbian pornography, so that's an exception to my general dislike of watching other people play with toys. I absolutely hate strap-ons, primarily because it looks so awkward and if I wanted to see boning, I'd watch straight porn instead of girl-girl.