How or where do I choose colors?

Star Shower comes in Red and Green, in tone with the holiday spirit. Pressing the switch towards the Green stripe will emit only green laser light. Pressing the switch towards the Green and Red stripe will emit both colors which is different from any snowflake projector

The green color shows up the best, red is much less visible, especially on darker backgrounds.  Green is definitely the best for longer views.

The projector can also shine blue, but those dots are hard to see unless you put the light closer to the wall or tree.