If you add a half a block of the blue background to the top of every other column, and to the bottom of the rest of the columns, you will break up that lock-step by offsetting your columns.
That would be the simplest fix.
Your blocks are lovely!
eta: Oops, I see maggiemay gave you the same advice. Great minds, maggiemay!
Last edited by sewbizgirl; 07-08-2014 at 03:10 PM.