I use boiled linseed oil (BLO) on most woodworking projects, assuming I'm not going to paint them. IMHO it brings out the natural grain and color of the wood.
Most of the time, but not always, I'll add a topcoat like shellac, lacquer, varnish or what-have-you. I think a top coat adds a finished look. Let the BLO thoroughly dry before adding any top coat. I generally mix 50/50 with mineral spirits. But that only helps the BLO flash off and makes it easier to apply.
Experiment with finishes on scrap stock.