Many recent maps I have seen have these neat two-way color gradients that can be used to color correlations between continuous estimates.
Here is an example is taken from a recent publication.
Christian Levers, Pieter J. Verkerk, Daniel Müller, Peter H. Verburg, Van Butsic, Pedro J. Leitão, Marcus Lindner, Tobias Kuemmerle - Drivers of forest harvesting intensity patterns in Europe. Elsevier. 1 March 2014 (access: http://dx.doi.org/10.1016/j.foreco.2013.12.030).
I believe those gradients have been generated with ArcGIS 10.x and I was wondering how I could reproduce such color gradients with freely available GIS tools (or at least those available on Linux)?
Happy to hear suggestions or code snippets.
Answer
Excellent answer by @Martin but it seems you have 2 attributes you want to have a colour gradient (Plantation Cover and Forest Harvesting Intensity). If I'm mistaken then I will remove this post. You could set up a Rule-based style, create a new rule, edit the symbol layer from a Simple Fill to a Gradient Fill. Create a filter for your attribute column and set your colours. Then repeat by adding another style rule:
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