Those are some pretty cool stamps and I might have to get some for my collection. If what you have are really brown leaves it has to be a printing error. There are none listed on
ebay with brown leaves. The more I look at your pictures it appears one of the stamps is missing all of the green color in other areas (the tree branch looks different).
Check this out
http://www.ebay.com/itm/Scott-2482a...em19b221f2fb I don't know if you have any of these but this seller is asking a lot and has offers.
Yours may be an unidentified variety not known by scott? Maybe a new #2482b ??
If you don't have a good camera look at
ebay for a nikon coolpix 2100 they are what I use and I get some fantastic pictures on the closeup setting and the camera only cost about $20. You will need a memory card and cord to connect it to the computer and a rechargeable battery. It is worth the investment.
I am totally new to stamps so I might be completely off with this but the little research I have done it looks like you might have something.