"Awful" Waffle

This just didn't work.

I worked out how to arrange the colors in a sort of "Waffle Weave" arrangement, but when I tried it out on a 4x4x4 cube it looked horrible. Really, just look at it!

So I tried again on a 5x5x5, hoping the background color between the stripes might make them more visible. It did, but it still looked awful.

Oh well, I've got better ideas...

[Edit] Patrick C noticed the Waffle pattern is somewhat clearer if you concentrate on just one face at a time. Sure enough! From the angle shown below, the pattern is even visible on the 4x4x4. (If you squint.)

5x5 Cube in Cube in Cube in Cube in Cube

Cube pattern expert Per accurately pointed out that my 4x4 Quad-color Boxes pattern is basically a mixture of two common patterns. I decided to push the concept to its maximum extreme, which you can interpret as five nested cubes or five nested rings.

4x4 Psychedelic Herringbone

The diagonal stripes crowd five different colors onto each face of a 4x4 cube. The pattern is created by rotating face and edge cubies around four of the cube's eight corners.

It's a worthwhile exercise for the experienced cuber, even if you don't really like how it looks.