First minecraft clay soldiers mod there are these little soldiers you can make different teams and you can upgrade them
Youtube: www.youtube.com/watch?v=myJWA4zMgDA
Download: www.minecraftforum.net/topic/495553-173-kodas-clay-soldier-mod-v2-new-stuff/

Second theres is the toomanyitems mod its a mod that gives you any block you want
Picture: hacks.games-offline.com/wp-content/uploads/2011/07/toomanyitems.png
Download: www.minecraftforum.net/topic/140684-173-toomanyitems-in-game-invedit-july-1/

Third a people mod that add people to your solo game like lumberjacks, miners, villagers, etc.
Download/website: minecraftworld.wordpress.com/2011/02/08/humans-minecraft-mod-minecraft-npcs/

fourth is commands mod its a mod where you can fly get blocks in solo player etc.
Download: www.minecraftforum.net/topic/94310-173-single-player-commands-v210-2/

5th is one of the best mods ever created the aether mod i heard its amazing
Youtube: www.youtube.com/watch?v=X5-MEj6k_0Y
Download: www.minecraftforum.net/topic/495374-173-aether-collaboration-mod-v101-bug-fixes/How to download: www.youtube.com/watch?v=G-CNiEuWNeE

IM NOT THE PEOPLE WHO MADE THE MODS OR THE PEOPLE IN THE VIDEOS!