It wouldn't be a patent infringement, Rick, but likely a trademark infringement. Someone can commission you to build an item with the Harley Davidson or Edmonton Oilers logo and you can build that for them royalty free. You can build a hundred of them and give to friends and family if you want. But if you decide to build more and market them for sale then you'll have to pay the piper.
Basically you can - patent a design, machine, or product, etc.; trademark a word, phrase, style, or design that identifies or separates your product from others; and copyright an original artistic endeavor (song, woodworking art, painting, etc.).
Each has its own lifespan, as well. In general a copyright for the original idea holder lasts until his/her death plus 70 years. A patent is 15-17 years depending on the type and who you talk to. A trademark is generally indefinite. Obviously there are exceptions and additions to this and qualifying conditions but this is a fair rule of thumb (for US items, that is, not international - whole different ball game).
I didn't research this so if I'm off a bit I'm sure someone will let me know but this is the general knowledge I try to keep in mind. And likewise there are volumes of this on the Internet but if you need to take advantage of most of this you'll be working with an attorney anyway.