I've been thinking about this today. I think it's a good tip that maybe isn't as well known. If you're interested in making a 2D target, you can go find a picture on the internet and print it in "tiles" on the computer. I use Microsoft Publisher to do this, and it works pretty good.
Get your picture.
Save it, or snip a screenshot of it using the Snip & Sketch tool in your PC's accessories folder.
Open publisher. Paste your picture onto the canvas in the software. Set the page width and height as the size that you want the target to be.
Select "Tiles" as your print option.
Here's how it will print:
Each little rectangle in the preview will be a single page. You have to print the pages, cut them out, then attach them to your background. It is a little bit of work and messing around, but in the end you can make either a stencil for painting a silhouette, or use the picture as the target. They don't all have to be gigantic... I set this elk example up to create a target 110" x 85". They can be as big or small as you'd like.