Hi,
I've never had a floor epoxied but I am an artist and have extensive color and design experience.
My opinion is:
Depending on the size of the chips relative to the floor size, your beige, grays, and cream colors will sort of blend together in the eye and make an overall light color. The red will stand out. This is why many red chips added in can give the overall appearance of pink. The red is "mixing" with the light colors in your eye and the effect is pink. Fewer reds will make them stand out rather than blend in and it will be fine.
The lighter colors you have now will probably mix together and from a distance, simply appear as an off-white. You'll probably almost never be looking at the chips this close unless you've dropped something, so it will almost never look this good.
I would probably not have so many color chips in your attempt to match you everything else so perfectly. Also the shininess of the epoxy may cause the color to look lighter than it really is. This also depends on the size of the open floor. If once loaded up with cars and workbench, etc. you'll only be looking at small paths of open floor directly in front of you it will be okay. However if the chips are small, you probably won't notice them and the color will blend after about 4 feet distance.
From the samples presented, I would probably delete the beige, cream/ yellow and warm gray (same as your wall color) and only use white, a darker version of your cool gray (Dove Gray) and red.
Personally I would use the same darker version of the cool gray on the wall as well instead of the warm taupe you have in mind now. I think it looks better and will not look old and dingy so fast. We all get there eventually but why rush it? I like the stripe idea and painting the upper wall white. Make the red stripe as wide as possible (maybe 10 inches wide?) while keeping the upper white area greater than half the wall height (>50%).
What ever colors you paint the walls use standard colors that the paint shop makes all the time. Custom colors are fun but no one else will know or care and when you want to retouch or paint something else it will be almost impossible to match.
I don't know how big the chips will be but I think they should be on the bigger side, say a few inches across. Otherwise you may find yourself looking hard for a dropped screw, spring or other small part. You'll find it of course but there's no point in making the moment comically frustrating by camouflaging your floor. Especially when it gets dirt and smudges on it through use. For example, you working in that same area for years.
Hope that helps.
Looking forward to pix of the work in progress and the final results.
