I would suggest no accent wall, but a color with more pigment for all the walls, neither yellow or taupe. Try something like this instead:

BM Beach Glass.

Instead of painting one wall another color, have you considered adding a texture or alternative finish? One of the trends I noticed at this year's market was this concept for "accent walls." As an alternative to painting one wall just a bolder or different color, designers are using upholstery, durarock or even lattice work on walls to add depth and make them stand out. This pic is an example of the durarock.