Hey Perry, nice to meet a neighbor. The year you are looking for is 1923, but that is only published items. Unpublished items fall under the creator lifespan plus 70 years. My major point above for everyone was that unless it specifically listed as public domain, scrollers should assume the item is copyrighted and seek to get permission for use. I've already received permission in the past from Getty Images to use a couple of their images. Most copyright holders are thrilled someone even bothered to ask, and that makes it easier for them to say yes.
Where it gets really complicated is things that are trademarked. Corporate logos are the biggest issue for most scrollers and pattern makers. Let use the #3 Goodwrench Chevrolet driven by Dale Earnhardt Jr. as an example. You could create a pattern of the car and the #3 on it, but you would have to leave off the Goodwrench logo as well as the logos of the secondary sponsors since all of them are trademarked. Basic shapes could be used to denote where the logo is, but not the logo itself. The same goes if you're trying to do a pattern of a Harley Davidson motorcycle, the shape of the logo is ok, but you can't use the words Harley Davidson within that shape. The simplest way to avoid trademark violation issues is to stay away from anything with a logo. This applies to team names as well. They are all trademarked.
I had a long chat with a member of the NASCAR licensing dept. and another individual at Harley Davidson. It is definitely beyond the means of most scrollers and pattern makers to afford the licensing fees associated with being able to use a trademarked item in a pattern.
Barry