One of the fasted carvings that I have found is to carve hotplates. They are standard in size being 6 1/2 x 8 1/2 inches with four rubber feet on the bottom. They sell for $20 each and sell like hotcakes...

I have made different hotplates for various sports teams, depending upon my location for a show.

Here's one example:

These are pure profit.. as I have no material costs other than a few minutes and paint.

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