Yes, as the casual quilter said, they look stunning.
I plan on doing one and have started collecting ties. I carefully take them apart first, wash by hand and iron whilst still a little damp. If you do this, you will then see which bits are usable (check for stains, worn bits). You can actually get quite a lot of fabric out of some ties, specially the wider ones. Washing them gets out the majority of the creases and also any residue of dry cleaning chemicals.