FrankenPacks
From The Battle for Wesnoth Wiki
"Frankenpacks" are images containing pieces of wesnoth sprites. These pieces can be copied and pasted together to quickly make new custom sprites. The Wesnoth community calls this process "frankensteining", and it's a common way to begin spriting, requiring little previous art experience. Frankensteined sprites will not be accepted into mainline, but are perfectly acceptable for use in UMC.
Elves
Orcs
- http://forum.wesnoth.org/download/file.php?id=15808 orcs, goblins and trolls
Humans
- http://forum.wesnoth.org/download/file.php?id=12868 humans
- http://forum.wesnoth.org/download/file.php?id=15699 more humans
Dwarves
- http://forum.wesnoth.org/download/file.php?id=15794 dwarves and gryphons
Undead
Drakes
Other
- http://forum.wesnoth.org/download/file.php?id=15809 nagas, mermen, saurians, ogres, yeti
- http://forum.wesnoth.org/download/file.php?id=13391 animals
Misc
- http://forum.wesnoth.org/download/file.php?id=15790 mega-pack with loads of stuff, including animals