I started work on an Android-based trivia-like game. You basically pick a topic (eg. volcanoes) and get a random set of 10 questions out of a bigger pool.
I'm really struggling to pick a colour scheme, and also, to pick a style or theme to use -- every choice seems arbitrary at this point. I do have a "company" site and colour scheme, but I doubt if that would be the right choice here.
How do I decide which theme/style/colour-scheme to use?
Iterate on the design:
Use a color scheme generator like Kuler to select a set of colors that looks decent. Put the colors in your code as constants so it's easy to change them.
Mock up the design. Look at it and see if it's pleasing.
If you like it, show it to some friends. Do they like it? Do they even notice? Is anything confusing?
Incorporate that feedback and continue refining.
Every trivia game that I've ever seen has followed the conventions from the board game Trivia. To some extent, I think that people have come to expect this, but it also gives some visual information.
If I see a light blue background or border I expect it is to do with geography. If it's yellow, I expect it is a history question.
While this isn't your overall colour scheme it could be useful to use for the questions.
Other than that, when choosing a colour scheme, try and choose one that visually impaired and colour blind people can also differentiate. There are some great tools to help with this, such as Chrome Daltonize!.
The overall decision is up to you. You have to decide what you think will be best.
