They remind me a lot of fractals. If you ever do this again, throw some glycerin in with the formula. You should get lots and lots of colors flowing about. Fourth one down really peaks my fancy. It is some sort of alien landscape.
I also like #1 and #3 best. It might be interesting to try focus-stacking these, too, but your selective DOF works really well. I think you might have some sensor dust.
The last two don't really do it for me. For example, in the last one, the colorful part that draws the eye is out of focus. It would be interesting to try to photograph just a flat bubble with lots of swirly color.
well I like all of these ...the 1st is like a cad drawing of the Beijing Swimming centre. I must admit the title of the thread caught me off guard, I thought I'd be looking at 'bubbles' the burlesque dancer.