Just two steps with LESS.

Be sure to use the LESS version of Bootsrap.

Include scheme.less anywhere. Include 1pxdeep.less after all Bootstrap LESS.

A working index.less might look like this:

@import "scheme.less"; // color scheme @import "bootstrap.less"; // bootstrap @import "1pxdeep.less"; // 1pxdeep theme @import "style.less"; // your own styles

Need help with LESS? Try the LESS CSS project page.