Buy an old or new hallway table to fit over your air conditioner (we modified a Rekarne console table from IKEA for a perfect fit). Measure, then use a power saw along a clamped straightedge to cut decorative plastic panel to suit sides and front of table.
Paint panels with spray-on plastic primer. Let dry. Prime table and let dry, then paint table and panels in 2–3 coats of Dulux Duramax in Vivid White. Let dry.
Screw panels to table legs and rails through predrilled holes at an even spread of connection points to secure.