I wonder what it is? TT6MM

This is part of the Tiny Tuesday Mystery Challenge. Here is a word from WalkingWombat.........

“I'm really looking forward to tomorrows TinyTuesday6 - Mystery Macro challenge.  Could I please ask everyone taking part to pass on the message via there journals to other blippers that we should all publish the actual item we publish tomorrow as an extra on Wednesday.  In other words, Wednesday is "REVEAL ALL DAY".   The tag will still be TinyTuesday6 - however a second one TT6MM will help us all to go straight to the mystery macros.  Please pass this on if you can”.

(PS. I expect Longshadow to get this......)