Allright, some time ago @paveusky told me to try with bokeh, when yoyo is spinning...daaamn, it was hard. Needed some help with that, because one person had to throw yoyo, and other had to shoot and try to focus. Me and @kasiek86 tried both combinations: one time she shoots and I threw the yoyo, other time it was inversely.
Few problems: 1. it is hard to throw a modern yoyo - really. 2. Spinning yoyo moves a little so it is hard to make photo "in focus". 3. there is small amount of light, so another reason, why is so hard to focus.
Also I have disovered something. When I had first attempts with bokeh like that, I had strange halo on my Nikon with kit lens. Few days ago I took it in my hands and search all menu. As it turned out, It was coused by D-lighting function turned on. I'm so happy, that my old camera can catch light like that :D