Can I set up a web page to allow users to pick their own color scheme?

On allowing a user to pick a color scheme, fairly easy to do, but it does take a full understanding of using Cascading Style Sheets to do it. Basically you would set everything up on the web site using CSS (Cascading Style Sheets) including all the color settings. You would then link to the CSS as an external file (easy to do). Then all you need to do is to first create several different CSS files, one for each color scheme you are offering (the color schemes would need to be set up before hand by you). Then you would need to write some JavaScript that would use a link on the web page to select the different CSS files. Not impossible, but it would also take a good understanding of JavaScript coding to do this part of it.