I have with me a Twitter Bootstrap HTML template. Separately I have a gradient/color generator that asks the user to specify his choice of color/gradient and then generates the CSS for user's choice of color/gradient.
What I want you to do is this--
(1) Show a web page from my template and allow a user to select one CSS element at a time-- eg button, menu etc.
(2) Now user clicks on a button and my gradient/color generator is shown. Now user selects a gradient/color using this generator.
(3) Finally, once user has finished specifying his gradient/color--> send the CSS for that CSS element (that was selected in Step 1 by user) to a API as a Less CSS variable.
(4) Update the page being displayed with the new CSS (that was generated by gradient generator and sent to API in step 3).
In this manner, user can create a custom template (using my existing Bootstrap template) very easily. Since I already have the template and gradient generator with me, this work should be quite easy for you.
The same thing has to be done for all the pages in my Twitter Bootstrap template.
Simple work for a good developer. I expect bids < $100.