One of the things I've learned was how to steal a clans reputation points. Far as I know its perfectly legit, just dirty :p.
There are two possible ways to do this.
1) Using an alt clan
If you have an alt clan which you use for raiding and such you can also use it to farm rep points for your main clan. When the alt clan obtains some reputation points after awhile simply make a two way war between your main clan and the alt clan. After this take one of the characters in the alt clan and unequip all his gear. Also you'll need several rezzers for the job. What you will be doing is repeatedly killing the alt over and over again. For every kill in a clan war you get a rep point. We just rotate the rezzers constantly reviving the alt and have a character kill him repeatedly (we have a shillen elder with a few thousand pvp kills cause of this lol). Technically you could do this with one rezzer but that gets rather boring and it takes forever so the more you have the better ^^. When you get a good rhythm going you can rez and kill the alt very quickly to rack up reputation points. If you don't want any of your alts deleveling simply make a new character and throw him in the alt clan.
2)Stealing from another clan.
The strategy is the same as far as killing and rezzing. Sneak an alt into a clan you are at war with. The take him to another location and simply kill him/her in the same manner as listed up above. It's really dirty (but also pretty entertaining if you don't particularly like the said clan you are at war with

). We've stolen 2000 rep points from clans before doing this method. Also it helps if leaders aren't on at the time you start doing it because if they notice your character delveling (which he will be doing) or their rep points dissapearing its an instant boot (and usually some lovely comments to go along with it).
Obviously this also helps your clan along and screws theirs, if your competitive like that. Figured I'd spread the love some ^^ good luck.
P.S. this is also my first post, so hi everyone!
