http://www.quilthistory.com/dating_quilts.htm
this has some interesting information about the prints (many of these blue/white and red/white fabrics showing in the quilt are shirting...the baptist fan quilting pattern is referred to in the article and is on one of the quilts in the picture. the missing patches that are completely gone are usually some shade of brown, the madder dyes used to produce them were extremely caustic and often simply disintegrated.
the patterns are certainly old ... this could be as early as the mid 1800s and as late as the 1930s... depending on the part of the country they were made in.... since they were discovered in North Carolina, that would favor the earlier dates... they are lovely and should be shown to a curator at a museum with textile collections...there is a large one in colorado but the name escapes me ... i will try to find something online to remind me.... there should be several museums in the carolinas due to the large amounts of textile factories in that area.