If I want to prepare a wedding present for my friend but not sure about the style of the album what?

I would say maybe try to find out what kind of color or theme that your friend's wedding is in. Even if you just find the color, ask them about how they want their wedding to feel, like royal, fantasy, professional etc. Using that information, you could find a nice pattern to match. As for colors, you can always pick to do the background of the album white, and maybe do the design in the color the wedding is themed in. If you don't like that, maybe take the color and do it light (insert color) or pastel, and do the design in black or white. If you want, I could do some extra designs with the information and maybe email it to you. I'm sure your gift will be beautiful no matter what you do. :)