Not convinced that this is effective:

Chamomile, cloves, basil and mint placed inside small fabric parcels make a traditional insect deterrent. Hung in the kitchen or conservatory, they look more attractive than old-fashioned fly papers. To make a herb parcel, cut out a long rectangle of organza or muslin, press the edges over and fold up into an envelope. Sew the two side seams using running stitch, then place the herbs inside and sew up the open edge. Fold the flap over and fasten with a button and a loop of thread, adding a loop in one corner for hanging.