Verdatum has pretty much covered all the bases. However, if you decide against the plushie route you can find those 3d foam heart shapes (http://www.lulusoso.com/upload/20120...pg_250x250.jpg
) at most any craft store. Seems like it would be a perfect base for this project. A bit of sanding to round off the bottom, seal and hard coat it however you like, then paint and add the additional ornamentation.