Here on Earth Browsing Sub-board I start to host and share my favorite GE cloud-imagery spottings, I have found while browsing Google Earth. All of your own findings are welcome in this thread!
One criterion it must be met, that image of the cloud is have to be exceptionally sharp and clear, so that fine-structure can be seen.
Now here you are two examples - my first findings:
*** Clouds in interaction, where it seems as if some cumulus updraft (probably erected from the swampy ox-bow wetlands on the ground) would just breaking through a thinner layer of cirrus clouds from below.
.And the one new I share by now is this sprouting cumulus with nice contrasts
------ EDIT: 2019.may.02.:
Also insert into this OP the following find of oGEC member 'sieminna', who shared it on oGEC in 2012. and who thought it weird enough to imagine something lurking behind it.