Is it possible to setup layer2 tunnels between guests across hosts?

Using vrbr? -- i.e the Guest is unaware.

On Host 1:

  guest (a) --- vrbr0 ------- 

                                  |

                                  |

 On Host 2:                  |

   guest(b) -- vrbr0 ------

Has there been any work done around it?

TIA,

-Sujay