Yes, I've been caught by the toast modding wave and made my own. Just some Aluminum or stainless steel and a regular toaster can do the trick.
Step 1: Safety
Before starting, you must be absolutely aware that this thing is powered from the mains and
as such it could kill you, cause damage or injuries. If you are not really skilled at mains
powered electric device and related safety building practice and are not well aware of the risk related, you are suggested to have a friend help you with this project.
Also, as a general rule, when you are working on dangerous things always have someone next to you instructed on what to do if something goes unexpectedly.
The main issue here is to make sure that in no way metallic parts of the prongs and shapes come into contact with the electric heaters of the toaster.
These notes are not just to scare or bother anyone, but I absolutely want that fun does not turn
Step 2: Parts
Just a few parts are necessary:
edit: thanks drcrash - Aluminum "flashing" from the roofing department of a home improvement store (1 mm thick circa)
A paper template
Scissors (or a LASER cutter, if you have one...)
Dremel or similar (not necessary, depends on shape's complexity)
A small fine file
A hammer and a wood block
Step 3: Measure
The basic idea is to place the Aluminum shape inside the toaster prongs so as to shade heat to some extent and get a white shadow of the shape on bread's browned surface.
I suppose you are going to use my template, but you are invited to do your own also and possibly post pictures.
The shapes comes with to flaps to be wound around the steel structure of the prongs. To do so you must be sure that the size is correct so as to make the flaps at the exact distance. Measure the distance you will tuck the flaps.
Now, with your drawing program resize the template so as to make the distance between the two flaps of each shape the exact length you just measured. Print the template.
Step 4: Glue
Cut the shapes, just leave some room around, don't need to be precise. Glue the shapes on the Aluminum sheet. You may not need to wait until the glue is dry. Just make sure it does not move easily.
Step 5: Cut
Using the scissors start cutting around the shapes. Some parts of the shapes you may want to finish with a Dremel or similar. You may need to file the edges.
Step 6: Remove the Paper
Now dip the shapes into water to dissolve the glue and remove the paper. A glass from Nutella(r) helps but is not necessary.
Step 7: Apply the Shapes to the Prongs
Apply the shapes from the inside of the prongs. Try to think before and then bend as Aluminum is fragile and the flaps will easily break after a few repetitive bends.
Step 8: Final Words and a Few Advices
Use plain Aluminum or stainless steel only: do not used painted tin as I did for my cookie cutters as heat here would transfer paint or finishing on your meal!
Try to avoid elaborate shapes: details will not show up
The toaster makes the difference: the larger the heating resistance the more uniform the drawing will be; try smaller bread slices or larger prongs (and toaster)
When you are tired of a shape, just remove it and do another one.
A final one: you don't need a toaster at all: just lay the Aluminum shapes on a pan and put your bread slices on it or, even better, use a press toaster.
You can also print a slice of meat.
Buon appetito !