Microwave the chocolate chips for 1 1/2 to 2 minutes in a microwave-safe cup or bowl. (I use a Pyrex measuring cup.)
Stir with a spoon.
If the chocolate chips aren't fully melted, microwave for another 30 seconds and stir. Repeat until they are all melted.
Pour into silicone ice cube trays.
Gently tap the silicone trays, or vibrate them, or wiggle them, to get any bubbles out, and to get the chocolate into the farthest corners of the design.
Refrigerate for a few hours.
To unmold, spread out a dishtowel flat on a table or counter. Pop the chocolates out of the mold onto the dishtowel. The dish towel will catch any chocolate scraps.
Tip: You can wrap the chocolates in aluminum foil, and maybe add a sticker for decoration. If you do that, I recommend that you tear the foil with your hands, not with scissors. Cutting foil with scissors will quickly dull and ruin the scissors -- I found this out the hard way!
Tip: Some of the chocolate shapes (such as peace signs) break easily when you remove them from the mold. If you need a certain number of chocolates, make extra to account for breakage.
Tip: If you have silicone trays that are very floppy or very wide, you may wish to put them on a cookie sheet to make it easier to get them into the refrigerator without spilling.