Maybe? Painted with crown moulding even? Pallet shelves. Make sure to check for HT (heat treated) stamp, not MB (some kind of chemical treatment). Also wash with vinegar or bleach or something to kill any little foreign travelers that might be hiding out.
DIY wall-mounted shelving :: Uses twin tracks & sturdy brackets; shelf heights are adjustable. Brackets are screwed to 3/4" boards that were sanded & stained. As was said, it's all about meticulous planning *before* drilling any holes :-) but otherwise a fairly easy project with readily-available components.