There is a lot of stuff in the Pendraken catalogue - but a lot of it is hidden away in somewhat obscure ranges.
One of the best is the ECW Artillery equipment pack

There are also a lot of different wagons in the various ranges, including medieval, ECW, SYW and WWII (and probably ACW).
There are some small standing stones in the norse range.
If you have looked at the dungeon ranges have you seen the furniture (tables, book cases, chairs)?
The other big source is model railway stuff - N gauge is the equivalent sale to 10mm, obviously most stuff is more modern but you can find bits and pieces. Kestral & Ratio stuff is plastic kits so easy to convert.