If possible I would like to make a theme where you can change colors in theme settings and the user can change them too.

I know that I would need a different .css for each color and extra folder for each image, but doing the coding is the hard bit.

I have looked at themes for 2.0.15 that have done that, but I am not able to convert those to work with 2.1  

Any ideas would be great please

Can you link me to a theme that does it so I can see.

one here https://custom.simplemachines.org/themes/index.php?lemma=2637 for 2.0.2 but works on 2.0.15

and one from Crip https://www.jpr62.com/theme/index.php?action=downloads;sa=view;down=14

another https://custom.simplemachines.org/themes/index.php?lemma=2629

I downloaded that bluezcolor zip and will go over it in a second or two. Waiting for a phone call.

I think the switch for the css is in the themes.js file. Does that help at all.

I Thought that too, but from what I see its Settings.template.php and other code in index.template.php, themes.js is in all themes even 2.1

also there are language strings in ThemeStrings.english.php in the languages folder.

I could not find anything in Settings.template.php Maybe i didn't look hard enough.

Ok there are 3 files that are relevant..

ThemeStrings.english.php
Settings.template.php
index.template.php

and obviously the .css for each color

Keywords to search is "variant" or "variation"

Ok will do that in a sec.

index.template.php file:

/*Theme changer*/

 $settings['theme_variants'] = array('default', 'green', 'red');

found that already, in fact I found most of them, now all I need to know is how to make them work in 2.1

Ok gonna leave it for tonight, going to have a few... a lot of rum and coke

Lol, I will look over 2.1 themes later. Maybe there is something on the theme site that changes color.

I shoulda known that.

You know @SychO is a member here, and perhaps could point you in the right direction.