Push a clove into each hole. The closer the cloves are to each other, the better.
Leave in a warm dry place for a few weeks, or in a low oven for a few hours. It will shrink quite a lot after it has dried.
If you want to suspend it, criss-cross a ribbon around it with a loop at the top.
They look and smell lovely in a bowl or hung around the house, and after Christmas can be put into a wardrobe, drawer or airing cupboard to keep clothes and linen fresh and moth free.