Is there any method by which we can choose pre-made 2 colour gradients, as we do to symbols. A pack of gradients, something like that is possible in Inkscape ?

It seems the gimp palette files exported by Inkscape do not support gradients. But the custom swatches in Inkscape do, so an Inkscape svg file can be saved with a collection of gradient swatches.

That file can be opened for copy/paste styles to other documents, or saved as a template.

Thanks. How do I make a swatch ?

Create any type of object with a gradient you like, and click the swatch button in the Fill/Stroke dialog. 

http://tavmjong.free.fr/INKSCAPE/MANUAL/html/Attributes-Fill-Stroke.html#Attributes-CustomSwatches

Thanks. It works just like you described. The only thing I am not sure is how to copy the gradient out of this file.

Objects having a gradient can be copied into another document, and the gradient should come along. Then, the gradient can be used for other objects as well.

Awesome !! Thanks :)

Hello,

Roy here.  I'm writing at series of tutorials, actually more of a book with each chapter being a tutorial.  I give an example of how to make a custom swatch in Tutorial 5.  It's at:

https://roy-torley.github.io/Inkscape_Tutorial/Tutorial05/Tutorial05.html

The material on swatches is about halfway down the page.  I hope this helps.

Best wishes for the spring season,

Roy