We did this last year for the first time. Maybe I'll get back out and revisit this.
We used black foam core and built a 3 sided box to blow the bubbles in. This way it gave us a perfect black background.
If you shoot slow enough and get lucky with the timing you can get some pretty cool pop photos. Frozen bubbles pop a lot slower, kind of like a slow balloon rather than a regular soap bubble.
At 1/160 and plenty of tries you should be able to get something like this.