Here's how to cut a decorative design out of the middle of a board. After choosing your design and carefully marking your pattern, prepare a starting point for your jigsaw blade by drilling a pilot hole that falls within the boundary of your pattern. Then with your jigsaw, follow the penciled outline carefully, removing small sections at a time.
For more on woodworking, consider:
Quick Tip: Jigsaws
7 Essential Woodworking Tools
10 Surprisingly Simple Woodworking Projects for Beginners