DIY Dirt Cheap Terrarium Tutorial. I’ve been seeing lots of expensive DIY terrariums and I’m thinking, “What? Why?” For the holidays I got my mom a $5 gorgeous heavy glass terrarium with a lid from Michaels (nice to have a lid because you never really have to water) and in winter my mom went outside and got the pebbles, moss and plants from outside her door. So I really like this tutorial from Her New Leaf keeping it cheap and easy. *My mom also put a tiny toy dinosaur in it so it looks like Jurassic Park.