You may want to theme or override so much of Blaze that you should really build a customised version. The best approach is to grab the code from GitHub, change the variables and mixins and build the toolkit yourself.

Step 1
Get Blaze

Clone the git repo:

git clone https://github.com/BlazeCSS/blaze.git 

Step 2
Install

Install node modules:

npm i gulp -g && npm i 

Step 3
Install

To build Blaze run:

gulp 

Ready to go!
Install

The output of your changes will be available in /dist

If you want to build the solution every time you make a change gulp watch will watch the appropriate files.