This is a display shelf I saw in West Elm that went for $100. My version costs about $10-20 to build, depending on wood and stain prices.
Step 1: Drawing It Out
Using those measurements I drew out the shelf outline on a 1/2" piece of plywood, about 2'x4'. (3/4" would work too, to make it more sturdy). You can get this at any Home Depot or Lowes.
Step 2: Cutting It Out and Sanding It Down
Step 3: Cutting the Shelves Out
After they are glued, I sanded each down same as the body, especially the edges.
Step 4: Attaching the Shelves to the Body.
In terms of attaching it to the wall, do whatever is most comfortable. Because this was early on in my woodworking experience, I didn't know how to route hanging holes directly into the wood, so I used triangular hooks (from Home Depot), which hang from nails hammered into the wall.
I recommend hanging holes as opposed to hooks because hooks are less stable, especially with such an oddly shaped shelf.
Step 5: Staining It
A technique I picked up from a coworker: instead of a brush, I used an old rag to dip in the stain and spread it. This way, there is a smooth distribution with no lines that brushes tend to leave.
Wear rubber gloves and a mask, stain is very hard to wash out (trust me, I know)!
I applied to coats, as per the directions on the stain container, and let it dry for 24hrs.
Step 6: Applying Polyurethane (optional)
I bought a spray can at Home Depot (generic brand) , so I sprayed the shelf outside, still with my safety glasses and a mask.
Again, I think I applied two coats, and let it dry for three or four hours before handling it.
Step 7: Hung and Decorated!
It's good for holding knick knacks and all sorts of small goodies.
If you so desire, you can install screw hooks into the body between the shelves to hang keys, necklaces, rings, pendants (you can tell a girl asked for this, right?).
Definitely an attractive project, makes any bare wall look attractive. Try to chose the stain that most contrasts with the wall on which the shelf will be hung.