The natural colors of some hardwoods (like hickory, cherry or walnut) are beautiful enough to obviate the need to add any other color. So, these hardwoods can suitably be considered for the flooring purpose..

Wine Country Hardwood Floors
Why is my hardwood floor dark or black near the windows or doors? you can install hardwood over concrete, either by glueing it directly, or

Glueing Hardwood Floors - Fix-it Forum: Home Improvement & Do It Yourself Repair Forum
(8th floor) in a high-rise bldg in NYC, so I have concrete floors. Home > Ask a Question > Fix It Forum > Glueing Hardwood Floors

glueing hardwood floors to concrete slab - Fix-it Forum: Home Improvement & Do It Yourself Repair Forum
hardwood floors and i need a recommendation on if i can glue these floors to Home > Ask a Question > Fix It Forum > glueing hardwood floors to concrete slab

iFLOOR.com - HardwoodAward Hardwood - Hardwood Floors
. when applied on floors, provides the most durable wood floor finish today. (and minimizing costs), the demand is ever increasing for do-it-yourself products

iFLOOR.com - Maple Character 2-Strip - NaturalAdvantage Click LS - Award Hardwood - Hardwood Floors
.Colors play a large role in the overall appeal of hardwood floors. when applied on floors, provides the most durable wood floor finish today

Floating
.The floor is installed by glueing the boards together Floors are also the easiest for the do-it-yourself customer to attain the floor of their dreams

Can traditional hardwood flooring be laid over concrete? - Yahoo!7 Answers
Also, when you say "traditional" hardwood floors, by the answers, people are need to float your floor by glueing the tongue and grove of each floor piece.