Your blocks are beautiful not ugly at all. I liked the idea of the white border, but you might want to find a medium to dark patterned yellow fabric and do a border first before using the white. In other words do a double border so the white won't look so stark. the Blue is lovely as well but again I would do a medium to dark patterned yellow fabric and do a double border. I think the blocks are lovely and two borders would frame them well.