Candy hearts, as noted above, seem easy and obvious and like something that would sell.
Lots of SVG files out there of roses … carve in red oak, reddish stain and some tung oil … could be a trivet or whatever. Could even do a carve of a dozen roses arranged on a circle. With a V bit, I think it would go pretty quick.
Any other ideas I have get complex, like small wooden boxes to put chocolates or jewelry or whatever into.