Jackman's CQ Round Robin

Jackman's fabric store has a Crazy Quilt club.  The club is really taking shape and we just finished one round robin and are starting another.  We are supposed to have a theme.  I can't seem to name it, but have made the original blocks.  We were to create 6 blocks.  Similar to the CQI round robins, we will pass our blocks and each particpant will embellish a block.  On their return, we will have 6 finished blocks ready to assemble.

Here are my blocks.  I know they are all blue - but still don't know what to call the theme.