However, you can do the following:
* Create a scene with both characters: Use Lego bricks to build a setting where Green Lantern and Batman are interacting. You could have them fighting a common enemy, working together to solve a puzzle, or just standing next to each other.
* Combine their powers: You could build a custom Lego construct that combines elements of Green Lantern's power ring and Batman's gadgets. For example, a Batarang that glows green like a Lantern construct.
* Make a Green Lantern themed Batman: You could customize a Batman minifigure to look like Green Lantern. For example, you could add a green cape and a green head with the Green Lantern symbol.
To give you more specific ideas, could you tell me:
* What do you want to do with Green Lantern and Lego Batman? (Build a scene, make a custom construct, create a themed minifigure, etc.)
* What kind of Lego pieces do you have available?
* What are your interests and skill level with Lego building?
With more information, I can give you better guidance on how to create your own Green Lantern/Lego Batman project.