You don't have to have the wonder stuff with the sticky iron on stuff on the back to do an applique. If you have iron on interfacing, you can applique a simple shape. Here's how. (I also do my quilt labels the same way.)
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Tuesday Tutorial
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Cut out the shape you want to applique
on the non sticky side of the iron on interfacing.
Place the STICKY side against the RIGHT side of the fabric.
If you stitch about 1/8 inch from edge all around,
you don't have to trim away or clip
except in deep places like the "v" of this heart.
Use a 2.0 to 2.5 length stitch.
In the middle of the interfacing, make a slit.
DO NOT cut close to the edge.
Turn inside out through opening just made.
Now the sticky surface is on the outside on the back of the piece.
Press the edges with your fingers and
the help of a pin
or poker like my knitting needle
to pull out the seam.
DO NOT iron the seams out
because of the sticky surface on the back.
Position the piece and
iron into place.
The interfacing sticky back will usually hold the piece
in place while top stitching (or hand stitching) all around the edge.
Consider the stitch length to use according to the size and
meticulous turns of the piece.