The greener the color the higher the rent increase.

No rose colored glasses. 

I've got a tile shower that is original to the house (so 1975) that really needs to be refreshed, the tile is not the best color and the groute is discolored or missing in places.

Nationally (protecected classes highlighted):In the Sale and Rental of Housing: No one may take any of the following actions based on race, color, national origin, religion, sex, familial status or handicap:Refuse to rent or sell housingRefuse to negotiate for housingMake housing unavailableDeny a dwellingSet different terms, conditions or privileges for sale or rental of a dwellingProvide different housing services or facilitiesFalsely deny that housing is available for inspection, sale, or rentalFor profit, persuade owners to sell or rent (blockbusting) orDeny anyone access to or membership in a facility or service (such as a multiple listing service) related to the sale or rental of housing.Fair Housing--It's Your RightLocally there can be others.

Anyways, keep the colors to a neutral/earthy look.

I would like a book that recommends what projects to work on first, what paint colors to choose, what carpet to buy, etc.

(another words, Balloons)It is possible the seller has creamed the property.

As I said my current PC is colored card stock with text.

Hey @Natalie Heileson, here is a map showing the cap rates for SFR properties in Salt Lake city and surround areas.The darker colors correspond to higher cap rates. 

If they are lv plank, what brand and style/color?