Check out my tile-laying game, Denali. I love Carcassonne, but (among other things) I kept wanting features to be larger and wanting there to be more interaction between pieces. Much pondering and about a hundred playtests later, Denali is the result. So far, not accepted by a publisher, but I'm still looking.
I've also added a pretty unique solitaire game I designed long ago, A Farewell to Kings. It's seen several electronic implementations over the years and can be played with a standard deck of cards.