Im trying to find some free stl files to test 3d carving on my machine

so ive been looking for both 2.5d stl files I could play about carving into a block of wood something like this

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but then, id also like to have a play about with the 4th axis, so something I could mess around with the wrap facilities of aspire with so something like this

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id be grateful for anything! that anybody has...... I assume i need stl files?

thanks in advance.

matt