Superfly_c,

I whip heavy cream (40% butterfat) with a hand held blender. I think it might turn into butter in a standard blender, but it can't hurt to try. Just watch for when it starts to thicken up and keep checking often.

When I was a kid we used a very cold metal bowl and extra cold cream. We whipped it by hand with a whisk. Took forever, but *always* worth it!