We've posted another project from our days gone by on the web. This one is how to make a simple sachet. I used lacy fabrics over a solid fabric. I also used a leftover lace ruffle. These are filled with potpourri. You could use scented cotton or spices or leave them stuffed with scent-less fluff!
Above are the two from the tutorial, heart shaped, but the instructions are able to be adapted to whatever shape you like. I used to own SewingWeb.com (now defunct) and this is one of the projects I created way back then. Okay, it really wasn't all that long ago, but here it is - Sachet.