Formation of Bubbles, blobs, and surface cusps in complex plasmas
Mierk Schwabe, Milenko Rubin-Zuzic, Sergey K Zhdanov, Alexei V Ivlev, Hubertus M Thomas, Gregor E Morfill
Phys. Rev. Lett. 102, 255005 (2009) - pdf (copyright: APS)

Movie showing bubbles, blobs, and surface cusps: movie - avi, 43 MB

color picture of microparticle bubbles - taken by Michael Kretschmer

Three - dimensional view of a microparticle blob