Vintage Sheets for Homemade Quilt

I finally found a vintage sheet that my son will like for his quilt! He wanted blue stripes(hard to find), so I found an (overpriced) flat sheet on ebay. I'll be making this quilt with another complementary colored solid sheet from a thrift, or from my collection.

I make very simple quilts which are more like comforters. Here is a toddler quilt that I made in 2007, and we are still using this one. It has held up well to washings. Because my son's quilt will be larger, I'll be adding some stitching to the middle to secure the batting.

I'll update when I get around to making this quilt.