I got some glow in the dark paint from home depot. You can use it on most of things. It is ten dollars. You can probably buy it online or make it for cheaper.
Step 1: What You Need
Few small rocks
White spray paint
Glow in the dark spray paint
Paint outside. The paint has fumes.
Step 2: White Paint
Get a few good sized rocks. Not big ones but not too small. Wash them off first. Paint the rocks white a few times on all the sides. Let it dry.
Step 3: Glow in the Dark Paint
When the white is dry put on a coat of glow in the dark paint. It needs to be shaken a lot. It comes out completely clear. Let it dry for five or so min. Put on at least three coats and let it dry over night.
Step 4: Glow in the Dark
Put it in sunlight to charge. It should glow for about four or five hours after dark. You can put theses outside or in a room or something for decoration.
Ps. This is my first instructable so leave a comment for improvements on my next one. Thanks!