When thinking about your wedding theme and color scheme thinks about these questions:
What are your favorite colors?
What is your vision for your wedding?
What looks good with the venue?
What theme are you leaning towards (modern, classic, outdoors, beach/water, shabby chic, rustic, wine, floral, etc)?
Then start to think about the smaller details:
What color with the guys be wearing?
What color will the girls be wearing?
What color will the tables be?
Lots of flowers?
What season will you be getting married?
What decoration do you want to be on the table?
Is your wedding at one or two venues?
By using these questions you can start think about what inspires you when thinking about your wedding.