Recently I created a mini Star Wars terrarium, complete with miniature Yoda, and these are the steps I took to make it. In the future I plan to create some other scenes, and I will be sure to post pictures of those.

Step 1: Plan
I started by downloading a few references photos and rewatched the scene where Luke crash lands into the murky swamp planet. From there I made a list of the materials I would need. Here's a list:

• Micro Machines X-wing and Yoda -- Luke and R2D2 would have fit well here too, but I didn't want to cramp the tiny space too much. You can find these toys fairly easily on eBay.
• Glass container -- Mine is a cheap one from Ikea, minus the lid
• Woodland Scenics Realistic Water -- Liquid modeling stuff that hardens after about a day
• Acrylic Paints -- To tint your water
• Glue -- I prefer gorilla glue, and it needs to dry clear
• Sticks and roots -- A variety of brown shades to create your tree and some left over pieces to crumble into the swamp water
• Moss -- I peeled my moss from our backyard, but you can also buy some on Amazon
• LEDs -- I purchased all of my lighting material from this model train store and this lighting package had everything I needed, and was easy to assemble.
• Electrical tape -- For wrapping up your LED wires

Using a small plastic container I mixed a tiny amount of acrylic paint (a swamp like color mixture) and then added in the realistic water. This water stuff will bubble if you shake it, so I was careful to instead stir it up, which took about 5 minutes. Next I took my mixture and poured it into my scene, about an 1/8 of an inch deep (as the bottle advises), spreading the thick liquid to the edges with a toothpick. 24 hours later it had hardened (this is the minimum amount of time it takes to dry). 

I repeated my mixture and pouring steps, this time tweaking the color a bit to be more in line with what I wanted, but this time I also dropped in some flakes of twigs and dirt in order to get some grimy texture imbedded into the water. With the second pour I waited 48 hours, in order to make sure it was fully dry before moving to the next step. At this point, it was safe to remove the twine from the stick bundle, as the glue and water held it firmly in place.

Step 3: Moss and Lighting
I tore my moss into a few manageable chunks and then stuffed them into place, making sure to curve the pieces downward on the edges so that no matter what angle you looked at the terrarium it would still look good. I connected my LEDs, following the instructions that came with the set, and then used some electrical tape to bundle it into a tight fit. I squeezed the lighting set into place, tucking the bulk of the bundle under the moss patch, with the lights fitted under the wings.

Step 4: Yoda
Lastly, I glued Yoda on top of the moss hill using some gorilla glue, and then turned on the lights to enjoy the final product.