Snow Globe

Limited Edition Mojave Landmark Snow Globes are collectible items $$ There are a total of seven of them to find in the base game, and an additional four from the add-ons: one each from Dead Money, Honest Hearts, Old World Blues, and Lonesome Road.

Gameplay
The seven globes in the original game can be sold to Jane for 2,000 caps apiece, which will also add them to the snow globe display stand in the Lucky 38 presidential suite.

Snow globes found in add-ons are displayed on a shelf located directly above the snow globe stand. As soon as one is picked up, 2,000 caps will automatically be given (with the exception of the Sierra Madre snow globe, which will instead give 2,000 Sierra Madre Chips) and the snow globe will appear on the shelf.

Related quests

 * Useless Baubles or Fancy Trinkets?

Behind the scenes
Joshua Sawyer stated that he likely came up with the snow globes, because they represent a "little perfectly controlled world," in the vein of Citizen Kane.

Bugs
Sometimes you can only sell snow globes to Jane one at a time, regardless of the number you've found.