However, personally the ones/people that are most memorable are those with the unorthodox shape, color, message.Occasionally I'll run across someone who hands me a card that is round, is a bi-fold, or has a bold call-to-action on it that drives me to their website, or something simular.

In MS Word, remove the Yellow coloring on the letter (you don't need this now because you are using yellow paper as your base paper to print on). 3.

Using hand written letters, one color over another, these things are part of the science of marketing, with the sole purpose of getting your message opened and read.

And the paper colors that work are yellow and pink however any of these work well And her is something I posted about postcards in the Marketplace.

Its like coloring by dots but only having one dot colored...Yellow Letters tend to fall somewhere between 8% to 25% although I have had times where customers have had 50%+...

Also looked at your site and love the new color postcards.

Its move in ready after a good cleaning, and maybe some new paint over all the vibrant colors (unless you love "Auburn Orange").

Does anyone use a different color besides yellow for their direct mail? 

Red has a discount color association and plays to the sub conscious of the seller as you jot things down.  

You brought up about bad inventory and specifics about PVC or other plastics, the colorants and their lack of value due to specific product manufacturing.