No, you'll be able to make the dream. The images you portray will only have a large radius for you and a few other people around you. Once the group becomes larger you will need more people to put things together. But yeah, if you wanted to build a snow man you could. 

I'll go a bit more in depth:
You have two layers when dreaming. 

The shallowest layer is what you come up with, and what you want to see. This is energy consuming and you can only do it for so long before you need time to rest.

The deepest layer is your subconscious. Your mind thinks it up without you realizing it, so maybe one day you're in a park, maybe your on the moon and you don't know why.

The people around you can alter your thoughts but when you know you're the reasoning for the scene you have the power over the scene. 

Does that make sense?