Tell your wife I cut a square of some leftover fabric about 4" larger than the lid's diameter, folded the square in 4ths, then cut the edge in and arch so it was round. The elastic I happened to have on hand was half inch wide so I turned the edge of the fabric under about an inch and stitched to almost all the way around to make the casing, ran the elastic thru it, stitched the ends of the elastic together after adjusting it a bit for size, then stitched up the rest of the casing. Easy as pie!
Wade,
I just hope my cat doesn't think she can sleep on my tribal drum! I'm guessing she'll only do it once!