Let's start from the very beginning as it is a very good place to start.. LOL But seriously let's start with picking what type of cup you would like. 

If you are not wanting a snow globe type style we have Coffee Mugs and No Spill 40 oz stainless steel cups in many colors that are perfect and you can add a wrap and possibly a customized lid to still make it your own!

Now... If you are wanting a Snow globe tumbler, we have many, many options to choose from. Depending on the effect you are wanting for your cup here are some suggestions:

If wanting to do a lava drip I would select the 40oz, 24oz or 16oz tapered in order to get the desired effect.

If wanting a snow globe or a honey drip that can really be done in any cup to be honest.