Thanks guys. As long as I don't have to go into downtown TO, art supplies are fine
Butcher paper was my first thought but I had no idea if it even existed any more, now that meat comes in little plastic trays made from a quart of oil. If it still exists, guess I'll look for that first. Presumably I should look for a roll of butcher paper rather than just buying a side of beef and asking to have it wrapped in paper... then again summer's here and I haven't smoked any beef since... yikes, 2 years.
Edit - I guess the other option is to pick up a 2x4 sheet of cheap hardboard, draw directly on that then cut it out to make patterns. Definitely cheaper than a side of beef.