
I had been trying to interest my oldest and was making jokes about how he should attend as a martyr, especially one that was unique like St. Lawrence, Pope St. Clement I, etc. His imagination and sense of humor was finally stirred by my suggestion to be St. John the Baptist after he was beheaded. This is what we came up with.
For the table, he took a box, fixed wooden fence stakes to it for legs, and a thin piece of plywood to the top so that a tablecloth would hang in a convincing way. We duct taped some spare fabric around the plywood edge so that the cloth went to the floor, and used an old decorative table cloth layered over that. He cut a hole big enough for his head to fit through the box and wood. We cut Xs in the cloth so that his head could fit through those. Then we cut an aluminum serving tray in two, duct taped the edges to protect him from cuts. This was to be fitted on either side of his neck in order to make it appear that his head was on a platter.
He really didn't need a wig, but thought an old ratty one we had was extra humorous. So he used red lipstick for blood on his neck, eye liner for a scruffy beard, crouched in the box, donned the wig, and tried to look dead. Unfortunately, this first dry run was the only picture I captured, but you get the idea.

My youngest daughter was St. Kateri Tekakwitha because she wanted to put her long hair to good use. :)
My middle boy was St. Joseph.
My husband went as St. Maximilian Kolbe in his prison uniform.
I transformed a striped pair of pajamas for the occasion.
And I went as St. Christopher holding the Christ Child (my youngest, curly-headed son.) I wore a button-down shirt of my husband's, some rolled up work pants, my rope sandals, carried a staff, and lugged my son around. He was dressed in a white onesie under a white slip, with white leather slippers. He was absolutely adorable.
My oldest two were the only saints depicted during or after martyrdom. I guess that's a bit gruesome, but we tried not to be too gory, and it certainly resonated with my 'tween and teen. They would have been begrudging participants otherwise.