I wanted to decorate for Halloween but after checking out the available decorations I decided I'd rather save my $20 per tombstone and make my own. From my terrain making I have everything I need on hand to make some fairly decent tombstones.
Materials Needed
2" thick pink foam
hot wire foam cutter
black magic marker
tape measure
straight edge (can use a yard stick and combine with a tape measure
pocket knife
Total construction time: about an hour
Step 1
You start out with a chunk of 2" thick pink foam insulation. I
had this piece lying around my workshop but you can buy a large piece from any
home improvement store. My local store is kind of hit or miss for 2" thick foam
but when they have it it's about $30 for a 4' X 8' sheet.
First mark your foam to the dimensions you want. I used 12" wide by 20" tall for
a start. Draw a line 12" from one edge all along the piece of foam and a
second line at 20" from one side.

Step 2
(Note: If your foam cutter can reach your lines from the edges
of the foam then skip this step)
Now you have the basic shape of the tombstone marked you may notice that your
hot wire foam cutter is too short to reach all the way to the lines you drew for
your tombstone. If this happens take your pocket knife and cut around the
area you marked off (give yourself an inch or so outside your lines). You
only need to cut part way through. Be careful to not get any part of your
body in the way in case the knife slips. Once you've cut the foam put the
cut side away from you and your knee on the back side. When you pull the
edges of the foam towards you the foam will snap roughly along the line you cut.
This is good for getting a rough shape but you can't get a nice straight edge
this way.
Step 3
Mark the top of the square you drew earlier with two points on either side
that are 3.5" from the top of the tombstone. Also make a mark along the
top at the center point. We're going to use these points to draw the arc
that we're going to use to cut out the top of the tombstone. You can do
several different styles of tombstone this way. Just draw out what you
want and cut around the lines. It's one of my pet peeves when someone
edits a photo in a very obvious way and doesn't ever explain why so in the
interest of being completely honest I edited the econd photo was edited in Paint.NET
because I forgot to take a picture when I drew the top of the tombstone in for
real.
Sometimes I get too caught up in what I'm doing and forget to take the pictures
along the way.
Step 4
Use the hot wire foam cutter to cut around the lines you drew on the foam.
If it's not perfectly straight don't worry about it you can sand off the worst
of the problems. Any fine sandpaper should work fine for this step.
I'm using some hobby sandpaper I had on hand. It's more expensive than the
basic sandpaper but I can wash it out and use it over and over.

| Before Sanding | After Sanding |
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The final result is the basic shape of a tombstone. You can paint it as it
is and paint on text and a design or carve the text or a design into the foam.
See my tutorial on How to Carve Letters into
foam Tombstones for specifics on carving lettering. Below you can see
shots of the basic tombstone shape and what it looks like painted and with
letters carved into it.