This isn't my idea so won't take credit for it but it works. Get some neon colored paper, some clear packing tape and a can of (cheap) black spray paint. Take the tape and cover every part of the paper, paint the taped side with the black paint, let it dry. Put a paster on it (for a target dot) any size/shape you want. When you shoot the the paper shows through and Viola Shoot & See targets. Once you see it in action, it makes sense and it works well.
Too bad those full 8-1/2 x 11 clear sticky labels are soooooo expensive. Too often I have to buy Avery products. Staples sometimes has an equivalent, sometimes they don't, and sometimes they don't any more. The last circumstance annoys me.