Check your colors on grey scale to see if they will pop! As you can see their is a grey scale difference between all 4 colors. The two gradients together and the two solids together (diagonal selections) gave too slight a grey scale difference, which would have resulted in a lack on contrast in the brioche. Up and down worked for the left, but not the right, for the same reason. So I ended up using the top and bottom groupings.
Double stranded cast on – https://www.instagram.com/p/DeZt1IDOmfM/
Stitch in Focus: brpfyof – https://www.instagram.com/p/DeZuitXPhdN/
Stitch in Focus: pfbf – https://www.instagram.com/p/DeZ_VtxAAB4/
Stitch in Focus: kfbf – https://www.instagram.com/p/DeaA6epPUcN/
Two Color Brioche Knitting Working Both Colors At The Same Time
Stitch in Focus: brssk – https://www.instagram.com/p/DeaJC3TB5Za/ (note: as part of the bind off sequence)