Is the ole yellow letter with red ink thing really the best way to go about it or could I try blue ink?

I have just sent my first 400 yellow letters out on Friday, with another 400 to go out this Wednesday, and another 300 to go out next Monday so I believe that makes me far from a pro.  

I've gone through all the drywallers on angieslist and the yellow pages.  

Should I start sending yellow cards?

yellow letters, MLS and wholesellers. some people do court auctions as well.

So far i have sent out a little over 600 yellow letters (mainly to absentee) and haven't gotten the responce rate i was hoping for :/  ( also doing a couple bandit signs, And soon going to start posting ads on craigslits or other real estate sites ) But i know once i get a deal it'll be a snow ball effect.

I'm doing a 6 month yellow letter campaign to a list of 500 people.  

And I thought they were good renters until I went in my house and it was painted pink and yellow.

the exemption from what we see in the states that are cracking down is you can offer a contract.. but it cannot describe the home send pictures of the home beds baths etc etc.. you can only say you have this contract for sale.so for those who thing they need to get started as wholesalers this is a pretty restrictive covenant and probably keeps them from getting any traction.although from my experience with receiving yellow letters and other marketing for my properties the amount of follow up is pathetic and the people I talk to clueless by and large..

Yellow building, brown trim.