Mainly around Umeå, Västerbotten, Sweden. Either from friends property, or trees the municipality fell or wood from naturally fallen trees.
For Sloyd one simply needs to walk about to be inspired, walk in the woods, visiting a museeum, thrift shop. Feel and look at objects that pleases you and ask yourself why? Explore!
Good sources of inspiration this day an age is of course fellow SLoyders at Instagram, searching for #spoons #slöjd for example.
One of the sharpest sloyder I know is one from my neck of the woods, Jögge Sundqvist, son of Wille Sundqvist. He have written great books and is well worth a look, www.surolle.se
In Sweden you are allowed to publicly use the knife to sloyd, as long as you do it calmly and intentionally. Be smart. You will have to read up on your own laws where in the world you are but with the Sloydpung one does become very clear in why you are useing a knife - to sloyd.
Easiest answer is when it's needed. If it feels dry/soaks up water easily then yeah, definitely apply a new layer of linseed oil. Patina will naturally accure after usage. A oilbath less then 15 minutes and dry off excess oil will do the spoon great. Be aware of a lingering taste, it will disappear and is of no harm for you.