The folks at Mill Creek Haunted Hallow have a nice PDF file on mounting printed signs to a wood backing. That might be a fun way to go because it allows you to create a graphic that is transferred to the wood rather than any actual painting or carving being needed. Take a look at http://www.millcreekhauntedhollow.com/images/MCHH_mounting_signs.pdf to see if it might inspire you. 