This year I am sending 500 Seed Packets to a condo/apartment area that one of my agents has been farming. We will co-brand the packets and letter. I've sent seed packets that past two years to my Realtor group but will be sending to prospective borrowers this year instead.
Here is a great resource if you are looking to send seed packs. I ordered the non-printed seed packs (15% off!) and will label with a sticker that has my info and the Realtors info. We will also include our cards in the mailing. Plan is to mail these out the middle of April.