Concrete wine rack. Make a wood box (cheap particle board is fine), use 4" PVC (spaced at least 1" apart) and fill with concrete. Add color tint if you want something other than gray. Wait at least 24 hours then carefully remove wood and PVC.
How to Upgrade an ugly oak bookshelf to look like a Pottery Barn one. Added a baseboard riser to make it taller and a board at the top, then added trim and crown moulding, painted with a stain blocking primer and Country Chic Paint in Dark Roast