I think if you put those colors together stand back a tiny bit and squint you will see the 'effect' of them together vs the invidual colors and that will help you the most. I dont see yellow but that is mostly a tiny bit of yellow goes a huge mile and it might end up screaming at you in the bargello which is a very sassy pattern and unless you want yellow to be your focus where your eye pops to I wouldnt use it. I havent made a quilt bargello but don't you have enough colors already? I have made them with needlework. I think it is much more difficult to do with fabric. I can see if I tried it a whole lot of seam ripping going on.