Well, I think technically it might be a fashion no-no for short girls (I am one of those myself), just like cuffed pants and long skirts. However, I also think that something trendy and fun like thigh high boots are fine in moderation, if you really want to give it a shot. The key would be how you wear them and coordinate with the rest of your outfit. Hue is key—I’m thinking you can maintain some leg length by dressing monochromatically—dark boots with dark tights, skirt, shorts, leggings, whatever you were planning on wearing it with, and possibly going so far as to keep the whole outfit monochromatic with some fun accessories to liven it up . . .