Make the best crafting mats available only in Cyrodil. Spread them out throughout the map and no where else.
This idea was originally floated by ZOS in pre-launch. Prior to the implementation of the disastrous and unpopular Veteran System, the idea was to have level 50 mats (the highest level) available only in Cyrodil.
The benefit of this is that it would force all sorts of players to go into Cyrodil. Crafters, traditional PvE players, ect. Or, if they did not want to risk the PvP, it would stimulate the economy by driving up demand for crafting-mats in the market place.
Currently, small scale PvP is essentially non-existent in this game. All of the action centers around large battles (often zergs) and territory control.
ZOS touted the many things to do in Cyrodiil which would stimulate PvP on a smaller scale. The Skyshards, Lore Books, Public Dungeons, Ect. The problem is that almost all of these things are one time content. Once you've collected it all, there's nothing to do.
The one repeatable thing, quests in the cities, has proven to be not worth much in terms of reward. You cannot level fast enough or gain enough gold for it to be worth the risk. Even if it were, there is little benefit once you have already reached max level.
Crafting mats would be repeatable. People would continually need to go back for these and spend time all round the map (most of which is currently uninhabited.)
This would stimulate solo-PvP and small group PvP (since people would surely form harvesting groups.) Players looking for a more small scale experience could stalk resource nodes looking for a fight.
Please consider.
@NordJitsu - Guild Master (Main Character = Hlaalu Idas)
GREAT HOUSE HLAALU