My suggestion is to SID hortizontally and vertically around each block. Then decide if you want to SID diagonally.
or decide if you want to do a design in the 1/4" square triangle blocks. I'm not sure the more decoratively design is necessary or would be appreciated, especially if you have not done FMQ. If I should do something inside the blocks then I would find a stencil that could be done on the walking foot. There are many gentle curved designs that will work. I could give you some suggestions from one of the on line catalogs if you are interested. since you need to get it done quickly then I would SID.