It is great the OP has been left some of his homes original brick. Anyone that has worked construction knows finding the exact color/texture match of brick or tiles years later...is a moot point. I don't know how many houses I have seen where people have closed in unwanted doors and windows on their brick homes...with non- exact color/texture matching bricks. Looks like ****..
I am surprised that so many GJer's have suggested to the OP to lay up a mailbox, brick walls, patios etc. when he has in no way... mentioned having brick laying skills. Having to ask people what to do with the spare brick on a forum, is a sign he has no experience in masonry.......
In my search for homes the passed 20 years, I cannot count how many times I saw handy homeowner attempts at laying brick on projects around the house they finally decided later on, to sell. Mailboxes, retaining walls, fire box patio grills on and on. Almost every one of them should have been torn down and the debris removed , before the house was put on the market....
Brick is like tile...unforgiving. It cannot be painted or caulked to make uneven mortar joints, unequal spacing, out of plumb, bowed, curved, head and bed lines, tilted brick ....look good. When the brick job is done....its done and is what it is . It takes a lot of time for a newbie to learn to lay brick right, and their first project will most times....not be their best job. Oh, I know now, the GJ'ers are now going to post their pics of their first brick project to prove me wrong. But one has to work with averages , in dealing with an individuals skill level, patience and budget. It takes years to perfect masonry skills and a lot of brick laid down...
On topic...Knowing his brick will have mortar weep holes in them, they either have to be laid in a wall or up on edge. They would make a nice landscape border laid tightly together in a curving 3 in. deep trench. Then in the future, they can be dug up and used as needed for repairs on the house. JMO though