I had an idea to create a card game based on RTS computer games. Start with a village, collect resources, destroy your opponents. But I really hate the destroy the opponents part, but love the town building. So my idea is to continue with the town building but make it a more cooperative economy.
So each player starts with a town, the town has x number of fields/plots that could be one of the following, Hills, Fields, Forests, Mountains, swamp. All can produce resources except the swamp. And the plots would be randomly drawn from a deck. As the town grows so does the number of plots they can sustain. The town then has buildings, such as blacksmith, granary, these can grow as well. To create a building requires a certain number or resources.
I have also been thinking that there should be special buildings that are unique to the game, ie there would only be one brick works for example. Certain buildings require the advanced components so there is a requirement to trade with the player(s) that have the buildings that create these components.
As an end game piece there should be a target to achieve. I am thinking a wonder of some form. So it becomes a race to build a wonder. I am also thinking that it possibly be a points game as well. Being the first to build your wonder gives X points but you get points as the towns prosperity/size increases.
The design theme I had in mind was medieval.
I had thought on this as I was writing it. Multiple wonders would be great, it would also stop resource blocking. I had also loosely considered each player being randomly given their wonder to create at the beginning of the game. One thing I had thought of was that the wonder had phases to build, at each phase you could acquire game points, so once started people would see what you are building.
@hulken: can you explain why you think this is a bad idea further. My rational for it is that it gives a defined end point to the game, but not making it he who builds first allows other to have strategies to accomplish points an potentially win. Babylon had the hanging gardens, look at it now (as an extreme example).