I think the value also depends a bit on the audience. The boxer quilt (which is beautiful, btw!) would seem to have a more reasonable value to people at an appropriate fundraiser, ex. a boxer rescue fundraiser vs. a children's hospital fundraiser. I'm sure there are baselines for this sort of thing and I would base it on what you might sell it for if you'd bought the fabric and made it if you're writing it off on your taxes. If you're assigning a value for the silent auction guests to see and bid based on then consider your audience and price appropriately.