We used the same color that we have on the exterior siding- BM Camouflage. We love the color, a soft gray green. Looks great, so much nicer than plain white. I think of the garage as being part of the exterior, not interior of the house. I don't know what type of paint my husband used, probably BM's cheapest since it is just the garage.

I used a light gray - it seems to help hide marks well. I may try my hand at painting and just paint the front wall a different color....I'd love to use a hot pink/fushia - but, I doubt that would help resale. So, I'll just using something pretty and neutral that goes w/gray. Maybe even just a darker shade.

We did ours in BM cameo white which has a little warmth to it...garages can seem dirty and dingy so a bright warm white helps offset that.

Most garages are painted white because it's what the builder used throughout the house. New home owners seldom think to paint the garage and by the time they think of it they don't want to move the stuff that is being stored there.
My Sis painted her garage a beautiful medium green and I'm thinking of doing the same. I like patty's idea of using the same as the exterior, but since I have a brick home I think I have more options.

BTW, if you're not happy with the yellow, there's no reason it has to match the flooring. There are sooo many colors to choose from!

You need to use an alkyd primer to spot prime the water spot. Water based primers will just let water spots leach through. Then you can paint it any color you want as long as the leak that created the water spot is repaired and it won't return.

I'm fond of using a greyed green for garages as it tends to hide dirt a bit and echo the outdoors visible through the open garage door. It too seems to be more of an "exterior" space to me than interior.