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Wow, talk about opening up a can of worms.
Well, the first thing that one would say is that this is free speech under the 1st Amendment. And this carries some weight. However:
1) "Symbolic speech" such as burning flags and and draft cards receive less protection under the 1st Amendment. See Texas v. Johnson, 491 U.S. 397 (1989) and United States v. O’Brien, 391 U.S. 367 (1968), respectively.
2) In addition, free speech must "sufficiently imbued with elements of communication." Spence v. Washington, 418 U.S. 405, 409 (1974). Meaning, a burning effigy, or burning anything, may not fall under 1st Amendment protection.
3) Finally, this may be interpreted as a threat against the individual. Threatening the President of the United States is a class E felony under United States Code Title 18, Section 871. It consists of knowingly and willfully mailing or otherwise making "any threat to take the life of, to kidnap, or to inflict bodily harm upon the President of the United States." The term "any threat" is not statutorily defined, opening this up for interpretation.
4) Finally, local fire codes have to be considered, as people who do this often are slapped with ordinance violations in addition to above.
So in sum, while this may technically be legal at first glance under the 1st Amendment, it is open to interpretation and may fall under ordinance/civil/criminal matters, and as thus you'd be asking for trouble by engaging in such an activity. Please be careful!
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