Birthplace of a new Project

This may well be the birthplace of a new Project!  I took a bundle of nearly-new linen down to the Charity Shop this morning and looking around the shop this glass tank took my fancy.  No idea why!  But I bought it anyway. Probably a fish tank, but I certainly won't use it for that!  Maybe a Butterfly Farm - it measures L44cm X W23 X H32 so it should be big enough.  Any other ideas welcome:-)