check out Judys mystery train think its the third one she has done an irish chain and there are dozens of examples of peoples work some worked some not so well.. I did it and loved my irish chain came out well one white one purple that really stood out. I think less color is more sometimes. If you go with what you have started out with the first catches my eye the most but maybe the lighter blue blocks would stand out more? I truly suggest you go see how everyone else did it and then you can make a better judgement call on what you want in YOUR quilt. after all your the one living with it in the end.