I have searched the internet for hours trying to find how to make these things, below are a few places I found tips. I can tell you honestly though that the easiest way to make these is with creativity and glue.
LOL no seriously, If you want to make a one all you need is a mason jar, a toy, glue, water (very little glycerin) and white glitter. Glue the toy (like a my little pony or a toy truck) to the lid of the mason jar. Let sit for a few hours. Fill the globe with water and add the glitter. Put glue along the inside rim of the lid and glue it to the jar while tightening. Wait another hour and then flip!! Instant snow globe!!
So much fun and you can make them with you’r children!! However, here is how to get fancy.
Martha Stewart Living, December/January 1998/1999
The shimmering magic of snowfall is always transfixing, whether it’s outside your window or inside this classic toy. Homemade globes let you create a wintry scene straight out of your own imagination.
Almost any jar works for this project: Baby-food, pimiento, and olive jars are good choices. Look for plastic or ceramic figurines (metal ones are prone to rust) at flea markets and hobby or model-railroad shops. Synthetic evergreen tips are available at many floral-supply stores.
If the jar lids are not in seasonal colors already, paint them with oil-based enamel paint. Sand the inside of the lid until the surface is rough. With clear-drying epoxy, adhere the figurine to the inside of the lid, and let the epoxy dry.
Fill the jar almost to the top with distilled water; add a pinch of glitter and a dash of glycerin (available at drugstores) to keep the glitter from falling too quickly. Don’t add too much, or the glitter will stick to the bottom of the jar when it’s flipped. Screw on the lid tightly, being careful not to dislodge the figurine. Turn the jar over and back again — and let it snow.
I got the next idea from Julie Ann Art She gave an amazing tutorial and pretty much makes it as simple to follow as possible.