I'm in northern virginia and lived in the area for a very short time. Less

But I also think a plain white will be more timeless in 20 years, maybe grey is just trendy right now. 

Modern and timeless.

gclid=CO6fmtqL3r0CFSsQ7Aodt1MAFw or this example of a fat bottom column: http://blog.missionmotif.com/tips-from-the-trade/craftsman-homes-equals-timeless-style/.

The investor is at the mercy of current conditions while invested.The operator makes money from performing services, they may or may not have capital at risk, most here on BP are operators, in and out of a deal in a short period of time, less than a year.So, if you ask an investor holding an asset how things are and vacancies are up, cash flow is down, maintenance expenses are up......they aren't going to be happy! 

I'm preparing to undergo a large rehab of a rental property duplex with the help of a contractor.  As the project progresses I'll ultimately have to decided what materials I like for design finishes, ie- paint, floor ...

There is no 5 year waiting period.....the rule is actually that you lived in the house for At Least 2 of the last 5 years (you could have rented it out for any time less than 3 years after you met the 2 year requirement, and still get the exemption).....but no 5 year required holding period.

Principles are timeless.

Kiyosaki opened me up to a new way of thinking and led me to people I've gained so much from like Jim Rohn (who I highly suggest looking to for sound, timeless philosophy), that it's tough for me to not recommend investors to at least give him a shot. 

Certain materials are timeless - non-busy granite countertops; white kitchen cabinets; subway tile (white or close); hardwood floors.